software Software is a set of computer programs and associated software documentation, documentation and data (computing), data. This is in contrast to Computer hardware, hardware, from which the system is built and which actually performs the work. ...

fork In cutlery or kitchenware, a fork (from la, furca 'pitchfork') is a utensil, now usually made of metal, whose long handle terminates in a head that branches into several narrow and often slightly curved tine (structural), tines with which one ...

proprietary {{Short pages monitor to free it from restrictive US laws on the exportation of cryptographic software. *The game ''

NetHack ''NetHack'' is an open source single-player roguelike video game, first released in 1987 and maintained by the NetHack DevTeam. The game is a fork of the 1982 game ''Hack'', itself inspired by the 1980 game ''Rogue''. The player takes the role as ...

'' has spawned a number of variants using the original code, notably ''

Slash'EM ''Slash'EM'' (''Super Lotsa Added Stuff Hack – Extended Magic'') is a variant of the roguelike game ''NetHack'' that offers extra features, monsters, and items. Several of its novel features, such as the Monk class, "conducts" (voluntary ch ...

'' (1997), and was itself a fork (1987) of ''

Hack Hack may refer to: Arts, entertainment, and media Games * ''Hack'' (Unix video game), a 1984 roguelike video game * ''.hack'' (video game series), a series of video games by the multimedia franchise ''.hack'' Music * ''Hack'' (album), a 199 ...

''. *

Openswan In the field of computer security, Openswan provides a complete IPsec implementation for Linux and FreeBSD. Openswan, begun as a Fork (software development), fork of the now-defunct FreeS/WAN project, continues to use the GNU General Public Li ...

and strongSwan, from the discontinued FreeS/WAN.

1981

* Symbolics Lisp Machine operating system, later called Symbolics Genera. Forked from the

MIT The Massachusetts Institute of Technology (MIT) is a private land-grant research university in Cambridge, Massachusetts. Established in 1861, MIT has played a key role in the development of modern technology and science, and is one of the m ...

Lisp Machine Lisp machines are general-purpose computers designed to efficiently run Lisp as their main software and programming language, usually via hardware support. They are an example of a high-level language computer architecture, and in a sense, they ...

operating system, which was licensed by MIT to Symbolics in 1980. This fork later motivated

Richard Stallman Richard Matthew Stallman (; born March 16, 1953), also known by his initials, rms, is an American free software movement activist and programmer. He campaigns for software to be distributed in such a manner that its users have the freedom to ...

to start the

GNU Project The GNU Project () is a free software, mass collaboration project announced by Richard Stallman on September 27, 1983. Its goal is to give computer users freedom and control in their use of their computers and computing devices by collaborat ...

.

1985

*POSTGRES (later PostgreSQL), after Ingres branched off as a proprietary project.

1990

*

Microsoft SQL Server Microsoft SQL Server is a relational database management system developed by Microsoft. As a database server, it is a software product with the primary function of storing and retrieving data as requested by other software applications—which ...

, from

Sybase SQL Server SAP ASE (Adaptive Server Enterprise), originally known as Sybase SQL Server, and also commonly known as Sybase DB or Sybase ASE, is a relational model database server developed by Sybase Corporation, which later became part of SAP AG. ASE was ...

, via a technology-sharing agreement concerning the

Tabular Data Stream Tabular Data Stream (TDS) is an application layer protocol used to transfer data between a database server and a client. It was initially designed and developed by Sybase Inc. for their Sybase SQL Server relational database engine in 1984, and l ...

protocol. * SWLPC, from

LPMud LPMud, abbreviated LP, is a family of MUD server software. Its first instance, the original LPMud game driver, was developed in 1989 by Lars Pensjö (hence the LP in LPMud). LPMud was innovative in its separation of the MUD infrastructure into ...

.

1991

*

Xemacs XEmacs is a graphical- and console-based text editor which runs on almost any Unix-like operating system as well as Microsoft Windows. XEmacs is a fork, based on a version of GNU Emacs from the late 1980s. Any user can download, use, and modify X ...

, from GNU Emacs, originally for Lucid Corporation internal needs.

1993

* FreeBSD, started as a patchkit to

386BSD 386BSD (also known as "Jolix") is a discontinued Unix operating system based on the Berkeley Software Distribution (BSD). It was released in 1992 and ran on PC-compatible computer systems based on the 32-bit Intel 80386 microprocessor. 386BSD inn ...

. * NetBSD, started as a patchkit to

386BSD 386BSD (also known as "Jolix") is a discontinued Unix operating system based on the Berkeley Software Distribution (BSD). It was released in 1992 and ran on PC-compatible computer systems based on the 32-bit Intel 80386 microprocessor. 386BSD inn ...

.

1995

* Apache HTTP Server, from the moribund

NCSA HTTPd NCSA HTTPd is an early, now discontinued, web server originally developed at the NCSA at the University of Illinois at Urbana–Champaign by Robert McCool and others. First released in 1993, it was among the earliest web servers developed, follo ...

. * OpenBSD, a fork of NetBSD 1.0 by

Theo de Raadt Theo de Raadt (; ; born May 19, 1968) is a South African-born software engineer who lives in Calgary, Alberta, Canada. He is the founder and leader of the OpenBSD and OpenSSH projects and was also a founding member of NetBSD. In 2004, De Raadt ...

due to internal developer personality clashes.

1997

*EGCS was a fork of GCC, later named as the official version.

1998

*

Grace Grace may refer to: Places United States * Grace, Idaho, a city * Grace (CTA station), Chicago Transit Authority's Howard Line, Illinois * Little Goose Creek (Kentucky), location of Grace post office * Grace, Carroll County, Missouri, an uninco ...

, from Xmgr, after that project ceased development.

1999

*FilmGIMP, later called CinePaint, from GIMP, to handle 48-bit colour. *

OSSH The Secure Shell Protocol (SSH) is a cryptographic network protocol for operating network services securely over an unsecured network. Its most notable applications are remote login and command-line execution. SSH applications are based on a ...

from

SSH The Secure Shell Protocol (SSH) is a cryptographic network protocol for operating network services securely over an unsecured network. Its most notable applications are remote login and command-line execution. SSH applications are based on ...

, when that project was proprietised. *

OpenSSH OpenSSH (also known as OpenBSD Secure Shell) is a suite of secure networking utilities based on the Secure Shell (SSH) protocol, which provides a secure channel over an unsecured network in a client–server architecture. Network Working Gro ...

, from

OSSH The Secure Shell Protocol (SSH) is a cryptographic network protocol for operating network services securely over an unsecured network. Its most notable applications are remote login and command-line execution. SSH applications are based on a ...

. *

Sodipodi Sodipodi was an open-source vector graphics editor, discontinued in 2004. It is the predecessor to Inkscape. Development Sodipodi started as a fork of Gill, a vector-graphics program written by Raph Levien. The main author was Lauris Kaplinski ...

, from Gill. * Steel Bank Common Lisp, from CMU Common Lisp.

2000

*

TrueCrypt TrueCrypt is a discontinued source-available freeware utility used for on-the-fly encryption (OTFE). It can create a virtual encrypted disk within a file, or encrypt a partition or the whole storage device ( pre-boot authentication). On 28 M ...

, from E4M when the latter was discontinued. *

Tux Racer ''Tux Racer'' is a 2000 open-source winter sports racing video game starring the Linux mascot, Tux the penguin. It was originally developed by Jasmin Patry as a computer graphics project at the University of Waterloo. Later on, Patry and the n ...

went proprietary in 2000, leading to several forks including OpenRacer, PlanetPenguin Racer and Extreme Tux Racer. *

OpenOffice.org OpenOffice.org (OOo), commonly known as OpenOffice, is a discontinued open-source office suite. Active successor projects include LibreOffice (the most actively developed), Apache OpenOffice, Collabora Online (enterprise ready LibreOffice) a ...

, from

StarOffice StarOffice is a discontinued proprietary office suite, intended to compete with the marketing-leading Microsoft Office. It served as the basis for open-source suites OpenOffice.org and LibreOffice. StarOffice supported the OpenOffice.org XML f ...

after Sun Microsystems made the source code publicly available. OpenOffice.org was eventually forked into

LibreOffice LibreOffice () is a free and open-source office productivity software suite, a project of The Document Foundation (TDF). It was forked in 2010 from OpenOffice.org, an open-sourced version of the earlier StarOffice. The LibreOffice suite co ...

.

2001

*

ELinks ELinks is a free text-based web browser for Unix-like operating systems. It began in late 2001 as an experimental fork by Petr Baudiš of the Links Web browser, hence the E in the name. Since then, the E has come to stand for Enhanced or Ex ...

, began as an experimental fork of Links. *

Fluxbox Fluxbox is a stacking window manager for the X Window System, which started as a fork of Blackbox 0.61.1 in 2001, with the same aim to be lightweight. Its user interface has only a taskbar, a pop-up menu accessible by right-clicking on the des ...

, from

Blackbox In Unix computing, Blackbox is a free and open-source stacking window manager for the X Window System. Blackbox has specific design goals, and some functionality is provided only through other applications. One example is the bbkeys hotkey a ...

. *

GNU Radio GNU Radio is a free software development toolkit that provides signal processing blocks to implement software-defined radios and signal-processing systems. It can be used with external RF hardware to create software-defined radios, or without ha ...

, from pSpectra. *

Xvid Xvid (formerly "XviD") is a video codec library following the MPEG-4 video coding standard, specifically MPEG-4 Part 2 Advanced Simple Profile (ASP). It uses ASP features such as b-frames, global and quarter pixel motion compensation, lumi mas ...

, was a fork of Open DivX. *

WebKit WebKit is a browser engine developed by Apple and primarily used in its Safari web browser, as well as on the iOS and iPadOS version of any web browser. WebKit is also used by the BlackBerry Browser, PlayStation consoles beginning from the P ...

, project was started within

Apple An apple is an edible fruit produced by an apple tree (''Malus domestica''). Apple trees are cultivated worldwide and are the most widely grown species in the genus ''Malus''. The tree originated in Central Asia, where its wild ancestor, ' ...

by Don Melton on 25 June 2001 as a fork of

KHTML KHTML is a browser engine developed by the KDE project. It is the default engine of the Konqueror browser, but it has not been actively worked on since 2016. Moreover, KHTML will be discontinued for KDE Frameworks 6. Built on the KParts fra ...

.

2002

*

GForge GForge is a commercial service originally based on the Alexandria software behind SourceForge, a web-based project management and collaboration system which was licensed under the GPL. Open source versions of the GForge code were released from 2 ...

, from

SourceForge SourceForge is a web service that offers software consumers a centralized online location to control and manage open-source software projects and research business software. It provides source code repository hosting, bug tracking, mirroring ...

. *

GraphicsMagick GraphicsMagick is a fork of ImageMagick, emphasizing stability of both programming API and command-line options. It was branched off ImageMagick's version 5.5.2 in 2002 after irreconcilable differences emerged in the developers' group. In additi ...

, from

ImageMagick ImageMagick, invoked from the command line as magick, is a free and open-source cross-platform software suite for displaying, creating, converting, modifying, and editing raster images. Created in 1987 by John Cristy, it can read and write ov ...

due to concerns over the openness of development. * The

Matroska Matroska is a project to create a container format that can hold an unlimited number of video, audio, picture, or subtitle tracks in one file. The Matroska Multimedia Container is similar in concept to other containers like AVI, MP4, or Advanc ...

container format, from the

Multimedia Container Format A container format (informally, sometimes called a wrapper) or metafile is a file format that allows multiple data streams to be embedded into a single file, usually along with metadata for identifying and further detailing those streams. Not ...

, due to differences in direction. * MirOS BSD, from OpenBSD. * Syllable Desktop, from the stagnant AtheOS.

2003

*

aMule aMule is a free peer-to-peer file sharing utility that works with the eDonkey network and the Kad network, offering similar features to eMule and adding others such as GeoIP (country flags). On August 18, 2003 it was forked from the xMule s ...

, from

xMule xMule (short for "X11 Mule") is a discontinued free client for the eDonkey peer-to-peer file sharing network intended to bring it to virtually all the major Unix platforms, with a particular emphasis on Linux. xMule was coded in C++ using wxWi ...

, which itself forked from

lMule lMule (short for "Linux Mule") was an early attempt to bring an eMule-like client to Linux started in January 2003 by Timo Kujala, who ported all eMule code to Linux by himself. Alternative applications were at the time command line applications ...

shortly before, over developer disagreements. * b2evolution, from b2/CafeLog. *

DragonFly BSD DragonFly BSD is a free and open-source Unix-like operating system forked from FreeBSD 4.8. Matthew Dillon, an Amiga developer in the late 1980s and early 1990s and FreeBSD developer between 1994 and 2003, began working on DragonFly BSD in ...

, from FreeBSD 4.8 by long-time FreeBSD developer Matt Dillon, due to disagreement over FreeBSD 5's technical direction. *

Epiphany Epiphany may refer to: * Epiphany (feeling), an experience of sudden and striking insight Religion * Epiphany (holiday), a Christian holiday celebrating the revelation of God the Son as a human being in Jesus Christ ** Epiphany season, or Epiph ...

, from

Galeon Galeon is a discontinued Gecko-based web browser that was created by Marco Pesenti Gritti with the goal of delivering a consistent browsing experience to GNOME desktop environment. It gained some popularity in the early 2000s due to its speed, ...

, after developer disagreements about Galeon's growing complexity. *

Inkscape Inkscape is a free and open-source vector graphics editor used to create vector images, primarily in Scalable Vector Graphics (SVG) format. Other formats can be imported and exported. Inkscape can render primitive vector shapes (e.g. rec ...

(vector-graphics program), from

Sodipodi Sodipodi was an open-source vector graphics editor, discontinued in 2004. It is the predecessor to Inkscape. Development Sodipodi started as a fork of Gill, a vector-graphics program written by Raph Levien. The main author was Lauris Kaplinski ...

. *

NeoOffice NeoOffice is an office suite for the macOS operating system developed by Planamesa Inc. It is a commercial fork of the free and open source OpenOffice.org that implements most of the features of OpenOffice.org, including a word processor, spreads ...

, a fork of

OpenOffice.org OpenOffice.org (OOo), commonly known as OpenOffice, is a discontinued open-source office suite. Active successor projects include LibreOffice (the most actively developed), Apache OpenOffice, Collabora Online (enterprise ready LibreOffice) a ...

, with an incompatible license (GPL rather than LGPL), due to disagreements about licensing and about the best method to

port A port is a maritime facility comprising one or more wharves or loading areas, where ships load and discharge cargo and passengers. Although usually situated on a sea coast or estuary, ports can also be found far inland, such as H ...

OpenOffice.org to

Mac OS X macOS (; previously OS X and originally Mac OS X) is a Unix operating system developed and marketed by Apple Inc. since 2001. It is the primary operating system for Apple's Mac computers. Within the market of desktop and la ...

. *The Safari renderer that became

WebKit WebKit is a browser engine developed by Apple and primarily used in its Safari web browser, as well as on the iOS and iPadOS version of any web browser. WebKit is also used by the BlackBerry Browser, PlayStation consoles beginning from the P ...

, from

KHTML KHTML is a browser engine developed by the KDE project. It is the default engine of the Konqueror browser, but it has not been actively worked on since 2016. Moreover, KHTML will be discontinued for KDE Frameworks 6. Built on the KParts fra ...

. * sK1, from

Skencil Skencil, formerly called Sketch, is a free software vector graphics editor, released under the GNU Lesser General Public License. Its first public version, Sketch 0.5.0, was released on October 31, 1998. As claimed on its website, "Skencil is im ...

when the latter moved from Tk to GTK+. *

WordPress WordPress (WP or WordPress.org) is a free and open-source content management system (CMS) written in hypertext preprocessor language and paired with a MySQL or MariaDB database with supported HTTPS. Features include a plugin architecture ...

, from b2/CafeLog. *

Zen Cart Zen Cart is an online store management system. It is PHP-based, using a MySQL database and HTML components. Support is provided for numerous languages and currencies, and it is freely available under the GNU General Public License. History Zen C ...

, from

osCommerce OsCommerce (styled "osCommerce" - "open source Commerce") is an e-commerce software solution. It can be used on any web server that has PHP and MySQL installed. It is available as free software under the GNU General Public License. History OsCom ...

.

2004

*Baz, the previous version of Bazaar, from

GNU arch GNU arch software is a distributed revision control system that is part of the GNU Project and licensed under the GNU General Public License. It is used to keep track of the changes made to a source tree and to help programmers combine and otherwis ...

. *

FrostWire FrostWire is a free and open-source BitTorrent client first released in September 2004, as a fork of LimeWire. It was initially very similar to LimeWire in appearance and functionality, but over time developers added more features, including sup ...

, from

LimeWire LimeWire was a free peer-to-peer file sharing client for Windows, MacOS, Linux and Solaris. Created by Mark Gorton in 2000, it was most prominently a tool used for the download and distribution of pirated materials, particularly pirated mus ...

after LimeWire's developers considered adding RIAA-sponsored blocking code. *

MediaPortal MediaPortal is an open-source media player and digital video recorder software project, often considered an alternative to Windows Media Center. It provides a 10-foot user interface for performing typical PVR/TiVo functionality, including playi ...

, from

XBMC Kodi (formerly XBMC) is a free and open-source media player software application developed by the XBMC Foundation, a non-profit technology consortium. Kodi is available for multiple operating systems and hardware platforms, with a software 10- ...

. * WineX (later Cedega), was a proprietary fork of

Wine Wine is an alcoholic drink typically made from fermented grapes. Yeast consumes the sugar in the grapes and converts it to ethanol and carbon dioxide, releasing heat in the process. Different varieties of grapes and strains of yeasts are m ...

. *

XOrg X.Org Server is the free and open-source implementation of the X Window System display server stewarded by the X.Org Foundation. Implementations of the client-side X Window System protocol exist in the form of ''X11 libraries'', which serve ...

, from

XFree86 XFree86 is an implementation of the X Window System. It was originally written for Unix-like operating systems on IBM PC compatibles and was available for many other operating systems and platforms. It is free and open source software under the X ...

, in order to adopt a more open development model and due to concerns over the latter's change to a license many distributors found unacceptable.

2005

*

Audacious Audacious may refer to: * ''Audacious'' (album), a 2016 album by Cupcakke * Audacious (software), an open-source media player Ships * List of ships named ''Audacious'' * HMS ''Audacious'', various ships of the British Royal Navy * ''Audaci ...

, from Beep Media Player to continue work on the old version of that project. *

Joomla Joomla (), also spelled Joomla! (with an exclamation mark) and sometimes abbreviated as J!, is a free and open-source content management system (CMS) for publishing web content on websites. Web content applications include discussion forums, ...

, from

Mambo Mambo most often refers to: * Mambo (music), a Cuban musical form *Mambo (dance), a dance corresponding to mambo music Mambo may also refer to: Music * Mambo section, a section in arrangements of some types of Afro-Caribbean music, particul ...

due to concerns over project structure. *

Claws Mail Claws Mail is a free and open-source, C/GTK-based e-mail client, which is both lightweight and highly configurable. Claws Mail runs on both Windows and Unix-like systems such as Linux, BSD, and Solaris. It stores mail in the MH mailbox format. ...

, from Sylpheed, due to perceived slowness in accepting enhancements.

2006

* Adempiere, a community maintained fork of Compiere 2.5.3b, due to disagreement with commercial and technical direction of Compiere Inc. *

Cdrkit cdrkit is a collection of computer programs for CD and DVD authoring that work on Unix-like systems. cdrkit is released under the GNU General Public License version 2. Fedora, Gentoo Linux, Mandriva Linux, and Ubuntu all include cdrkit. Joerg ...

, from Cdrtools due to perceived licensing issues. *

LedgerSMB LedgerSMB is a libre software double entry accounting and Enterprise Resource Planning (ERP) system, focussed on functionality required by small (self-employment) and medium size businesses. However, companies with millions of journal lines sh ...

, from SQL-Ledger, due to disagreements over handling of security issues. * MindTouch, a fork of

MediaWiki MediaWiki is a free and open-source wiki software. It is used on Wikipedia and almost all other Wikimedia websites, including Wiktionary, Wikimedia Commons and Wikidata; these sites define a large part of the requirement set for MediaWi ...

. *

Mulgara Mulgaras are the two small rat-sized species in the genus ''Dasycercus''. They are marsupial carnivores, closely related to the Tasmanian devil and the quolls, that live in deserts and spinifex grasslands of arid Australia. They are nocturnal, ...

, from Kowari after trademark threats from

Northrop Grumman Northrop Grumman Corporation is an American multinational aerospace and defense technology company. With 90,000 employees and an annual revenue in excess of $30 billion, it is one of the world's largest weapons manufacturers and military techn ...

. *

MPC-HC Media Player Classic (MPC), Media Player Classic - Home Cinema (MPC-HC), and Media Player Classic - Black Edition (MPC-BE) are a family of free and open-source, compact, lightweight, and customizable media players for 32-bit and 64-bit Microsoft ...

, a fork of

Media Player Classic Media Player Classic (MPC), Media Player Classic - Home Cinema (MPC-HC), and Media Player Classic - Black Edition (MPC-BE) are a family of free and open-source, compact, lightweight, and customizable media players for 32-bit and 64-bit Microsoft ...

.

2007

* Batavi, from

osCommerce OsCommerce (styled "osCommerce" - "open source Commerce") is an e-commerce software solution. It can be used on any web server that has PHP and MySQL installed. It is available as free software under the GNU General Public License. History OsCom ...

, due to that project's slow release schedule. *

Go-oo Go-oo (also Go-Open Office; previously called ooo-build) is a discontinued free office suite which started as a set of patches for OpenOffice.org, then later became an independent fork of OpenOffice.org with a number of enhancements, sponsored by ...

, from

OpenOffice.org OpenOffice.org (OOo), commonly known as OpenOffice, is a discontinued open-source office suite. Active successor projects include LibreOffice (the most actively developed), Apache OpenOffice, Collabora Online (enterprise ready LibreOffice) a ...

, due to that project's contributor licensing agreement.

2008

* Boxee, a proprietary fork of

XBMC Kodi (formerly XBMC) is a free and open-source media player software application developed by the XBMC Foundation, a non-profit technology consortium. Kodi is available for multiple operating systems and hardware platforms, with a software 10- ...

. * Dreamwidth, from

LiveJournal LiveJournal (russian: Живой Журнал), stylised as LiVEJOURNAL, is a Russian-owned social networking service where users can keep a blog, journal, or diary. American programmer Brad Fitzpatrick started LiveJournal on April 15, 1999, a ...

by ex-LiveJournal developers. *

Drizzle Drizzle is a light precipitation consisting of liquid water drops smaller than those of rain – generally smaller than in diameter. Drizzle is normally produced by low stratiform clouds and stratocumulus clouds. Precipitation rates from dri ...

, was intended as a slimmed-down and faster fork of

MySQL MySQL () is an open-source relational database management system (RDBMS). Its name is a combination of "My", the name of co-founder Michael Widenius's daughter My, and "SQL", the acronym for Structured Query Language. A relational database ...

. * MiaCMS, from

Mambo Mambo most often refers to: * Mambo (music), a Cuban musical form *Mambo (dance), a dance corresponding to mambo music Mambo may also refer to: Music * Mambo section, a section in arrangements of some types of Afro-Caribbean music, particul ...

. * Plex, a proprietary fork of

XBMC Kodi (formerly XBMC) is a free and open-source media player software application developed by the XBMC Foundation, a non-profit technology consortium. Kodi is available for multiple operating systems and hardware platforms, with a software 10- ...

.

2009

*

dbndns dbndns was a fork of the djbdns software package, maintained by the Debian Project, made possible by the release of djbdns to the public domain. The fork was created so as to add many common patches to djbdns. Most notably, this now includes I ...

, from

djbdns The djbdns software package is a DNS implementation. It was created by Daniel J. Bernstein in response to his frustrations with repeated security holes in the widely used BIND DNS software. As a challenge, Bernstein offered a $1000 prize for th ...

after the latter was released into the public domain and abandoned. *

Freeplane Freeplane is a free, open source software application for creating mind maps (diagrams of connections between ideas), and electronic outlines. Written in Java, it is supported on Windows, Mac OS X and Linux, and is licensed under the GNU GPL v ...

, from

FreeMind FreeMind is a free mind mapping application written in Java, which is further developed by the fork Freeplane until today (2021). FreeMind itself was last updated in 2014. FreeMind is licensed under the GNU General Public License Version 2. It ...

. *

FusionForge GForge is a commercial service originally based on the Alexandria software behind SourceForge, a web-based project management and collaboration system which was licensed under the GPL. Open source versions of the GForge code were released from 20 ...

, from

GForge GForge is a commercial service originally based on the Alexandria software behind SourceForge, a web-based project management and collaboration system which was licensed under the GPL. Open source versions of the GForge code were released from 2 ...

when GForge shifted focus to its proprietary version. *

Icinga Icinga is an open-source computer system and network monitoring application. It was originally created as a fork of the Nagios system monitoring application in 2009. Icinga is working to improve the Nagios' development process, as well as addin ...

, from Nagios, due to perceived slow development and problems dealing with Nagios LLC. * kompoZer, from Nvu after that project went dormant. *

MariaDB MariaDB is a community-developed, commercially supported fork of the MySQL relational database management system (RDBMS), intended to remain free and open-source software under the GNU General Public License. Development is led by some of the ori ...

, from

MySQL MySQL () is an open-source relational database management system (RDBMS). Its name is a combination of "My", the name of co-founder Michael Widenius's daughter My, and "SQL", the acronym for Structured Query Language. A relational database ...

, over concern as to Sun Microsystems' plans for the latter. *

Pale Moon Pale Moon is an open-source web browser with an emphasis on customization; its motto is "Your browser, Your way". There are official releases for Microsoft Windows and Linux, as well as contributed builds for various platforms. Pale Moon origi ...

, from

Firefox Mozilla Firefox, or simply Firefox, is a free and open-source web browser developed by the Mozilla Foundation and its subsidiary, the Mozilla Corporation. It uses the Gecko rendering engine to display web pages, which implements current ...

. * Qt Extended Improved, from

Qtopia Qt Extended (named Qtopia before September 30, 2008) is an application platform for embedded Linux-based mobile computing devices such as personal digital assistants, video projectors and mobile phones. It was initially developed by Qt Software, ...

after the latter was discontinued by

Qt Software QT or Qt may refer to: Arts and media * QT (musician) (born 1988), pop singer * '' QT: QueerTelevision'', an LGBT newsmagazine which aired on Canada's CityTV in the 1990s * Quentin Tarantino (born 1963), American filmmaker * ''Question Time'' ( ...

. * Voddler, is a proprietary fork of

XBMC Kodi (formerly XBMC) is a free and open-source media player software application developed by the XBMC Foundation, a non-profit technology consortium. Kodi is available for multiple operating systems and hardware platforms, with a software 10- ...

and

FFmpeg FFmpeg is a free and open-source software project consisting of a suite of libraries and programs for handling video, audio, and other multimedia files and streams. At its core is the command-line ffmpeg tool itself, designed for processing of vid ...

.

2010

* Peppermint Linux OS, from

Lubuntu Lubuntu ( ) is a lightweight Linux distribution based on Ubuntu and uses the LXQt desktop environment in place of Ubuntu's GNOME desktop. Lubuntu was originally touted as being "lighter, less resource hungry and more energy-efficient", but now ...

, due to a perceived need for a

cloud In meteorology, a cloud is an aerosol consisting of a visible mass of miniature liquid droplets, frozen crystals, or other particles suspended in the atmosphere of a planetary body or similar space. Water or various other chemicals may ...

-centric derivative of the

Ubuntu Ubuntu ( ) is a Linux distribution based on Debian and composed mostly of free and open-source software. Ubuntu is officially released in three editions: '' Desktop'', ''Server'', and ''Core'' for Internet of things devices and robots. All ...

OS. * Chamilo, from Dokeos, due to community management concerns with that project. *

LibreOffice LibreOffice () is a free and open-source office productivity software suite, a project of The Document Foundation (TDF). It was forked in 2010 from OpenOffice.org, an open-sourced version of the earlier StarOffice. The LibreOffice suite co ...

, from

OpenOffice.org OpenOffice.org (OOo), commonly known as OpenOffice, is a discontinued open-source office suite. Active successor projects include LibreOffice (the most actively developed), Apache OpenOffice, Collabora Online (enterprise ready LibreOffice) a ...

(and merging

Go-oo Go-oo (also Go-Open Office; previously called ooo-build) is a discontinued free office suite which started as a set of patches for OpenOffice.org, then later became an independent fork of OpenOffice.org with a number of enhancements, sponsored by ...

), due to Oracle Corporation's perceived neglect of the software. *

OpenIndiana OpenIndiana is a free and open-source illumos distribution Unix-derived System V SVR4 operating system, started as OpenSolaris continuation project. Forked from OpenSolaris after OpenSolaris was discontinued by Oracle Corporation, OpenIndiana ...

, from OpenSolaris after Oracle Corporation discontinued the latter. **

Illumos Illumos (stylized as illumos) is a partly free and open-source Unix operating system. It is based on OpenSolaris, which was based on System V Release 4 (SVR4) and the Berkeley Software Distribution (BSD). Illumos comprises a kernel, device d ...

, from the OpenSolaris kernel OS/Net, after Oracle closed down public access to the source code. *

webtrees webtrees is a Free Software, free Open source software, open source Web application, web-based Genealogy software, genealogy application intended for collaborative use. It requires a web server that has PHP and MySQL installed. It is compatible ...

, from

PhpGedView PhpGedView is a Free Software, free PHP-based web application for working with genealogy data on the Internet. The project was founded and is headed by John Finlay. It is licensed under the GNU General Public License, GPL-2.0-or-later license. Ph ...

, due to

SourceForge SourceForge is a web service that offers software consumers a centralized online location to control and manage open-source software projects and research business software. It provides source code repository hosting, bug tracking, mirroring ...

's policy on exporting encryption. *

Xonotic ''Xonotic'' () is a free and open-source first-person shooter video game. It was developed as a fork of'' Nexuiz'', following controversy surrounding the game's development. The game runs on a heavily modified version of the Quake engine known a ...

, from

Nexuiz ''Nexuiz'' is a free first-person shooter video game developed and published by Alientrap. The game was released under the GNU General Public License (GPL) and uses the DarkPlaces engine, a modified ''Quake'' engine. A remake, also called ...

, after that project was taken proprietary. *

Mageia Mageia is a Linux-based operating system, distributed as free and open source software. It was forked from the Mandriva Linux distribution. The Greek term () means enchantment, fascination, glamour, wizardry. The first release of the software ...

, from

Mandriva Linux Mandriva Linux (a fusion of the French distribution Mandrake Linux and the Brazilian distribution Conectiva Linux) is a discontinued Linux distribution developed by Mandriva S.A. Each release lifetime was 18 months for base updates (Linux, system ...

, due to financial uncertainty and the layoff by Edge-IT, a Mandriva subsidiary employing many of the corporate staff working on the Mandriva distribution * OpenAM, from OpenSSO after Oracle Corporation discontinued the latter. *

Calligra Calligra Suite is a graphic art and office suite by KDE. It is available for desktop PCs, tablet computers, and smartphones. It contains applications for word processing, spreadsheets, presentation, databases, vector graphics, and digital paintin ...

, from

KOffice KOffice is a free and open source office and graphics suite developed by KDE for Unix-like and Windows systems. KOffice contains a word processor ( KWord), a spreadsheet (KSpread), a presentation program ( KPresenter), and a number of other comp ...

after developer disagreements.

2011

*

Fire OS Fire OS is a mobile operating system based on the Android Open Source Project, it is developed by Amazon for their devices. Fire OS includes proprietary software, a customized user interface primarily centered on content consumption, and heavy ...

, a fork of Android for the

Kindle Fire The Amazon Fire, formerly called the Kindle Fire, is a line of tablet computers developed by Amazon. Built with Quanta Computer, the Kindle Fire was first released in November 2011, featuring a color 7-inch multi-touch display with IPS tech ...

* Jenkins, from Hudson (2011), due to Oracle Corporation's perceived neglect of the project's infrastructure and disagreements over use of the name on non-Oracle-maintained infrastructure. *

Univa Grid Engine Univa Grid Engine (UGE) is a batch-queuing system, forked from Sun Grid Engine (SGE). The software schedules resources in a data center applying user-configurable policies to help improve resource sharing and throughput by maximizing resource ...

, from

Oracle Grid Engine Oracle Grid Engine, previously known as Sun Grid Engine (SGE), CODINE (Computing in Distributed Networked Environments) or GRD (Global Resource Director), was a grid computing computer cluster software system (otherwise known as a batch-queuing ...

, after Oracle Corporation stopped releasing project source. * Mer, started as a fork of

MeeGo MeeGo is a discontinued Linux distribution hosted by the Linux Foundation, using source code from the operating systems Moblin (produced by Intel) and Maemo (produced by Nokia). Primarily targeted at mobile devices and information appliances ...

. *

libav Libav is an abandoned free software project, forked from FFmpeg in 2011, that contains libraries and programs for handling multimedia data. History Fork from FFmpeg The Libav project was a fork of the FFmpeg project. It was announced on M ...

, a fork of

ffmpeg FFmpeg is a free and open-source software project consisting of a suite of libraries and programs for handling video, audio, and other multimedia files and streams. At its core is the command-line ffmpeg tool itself, designed for processing of vid ...

. *

WooCommerce WooCommerce is an open-source e-commerce plugin for WordPress. It is designed for small to large-sized online merchants using WordPress. Launched on September 27, 2011, the plugin quickly became popular for its simplicity to install and customiz ...

, a fork of Jigoshop.

2012

*

MPC-BE Media Player Classic (MPC), Media Player Classic - Home Cinema (MPC-HC), and Media Player Classic - Black Edition (MPC-BE) are a family of free and open-source, compact, lightweight, and customizable media players for 32-bit and 64-bit Microsoft ...

, a fork of

Media Player Classic Media Player Classic (MPC), Media Player Classic - Home Cinema (MPC-HC), and Media Player Classic - Black Edition (MPC-BE) are a family of free and open-source, compact, lightweight, and customizable media players for 32-bit and 64-bit Microsoft ...

2013

* Blink, a fork of

WebKit WebKit is a browser engine developed by Apple and primarily used in its Safari web browser, as well as on the iOS and iPadOS version of any web browser. WebKit is also used by the BlackBerry Browser, PlayStation consoles beginning from the P ...

. *

SuiteCRM SuiteCRM is a free open-source Customer Relationship Management application for servers that is written in PHP. It is a software fork of the popular customer relationship management (CRM) system from SugarCRM and its base is built on the last o ...

, from the last open source version of

SugarCRM SugarCRM is a software company based in Silicon Valley. It produces the on-premises and cloud-based web application Sugar, a customer relationship management (CRM) system. SugarCRM's functionality includes sales-force automation, marketing cam ...

.

2014

*

LibreSSL LibreSSL is an open-source implementation of the Transport Layer Security (TLS) protocol. The implementation is named after Secure Sockets Layer (SSL), the deprecated predecessor of TLS, for which support was removed in release 2.3.0. The OpenBSD ...

, from OpenSSL. * Nokia X software platform, a fork of the

Android Open Source Project Android is a mobile operating system based on a modified version of the Linux kernel and other open-source software, designed primarily for touchscreen mobile devices such as smartphones and tablets. Android is developed by a consortium of ...

developed by

Nokia Nokia Corporation (natively Nokia Oyj, referred to as Nokia) is a Finnish multinational telecommunications, information technology, and consumer electronics corporation, established in 1865. Nokia's main headquarters are in Espoo, Finland, i ...

exclusively for its X family of Android smartphones. *io.js from

node.js Node.js is an open-source server environment. Node.js is cross-platform and runs on Windows, Linux, Unix, and macOS. Node.js is a back-end JavaScript runtime environment. Node.js runs on the V8 JavaScript Engine and executes JavaScript code o ...

. In 2015 it was blessed as the official version of node.js.

2015

* EdgeHTML, from

Trident A trident is a three- pronged spear. It is used for spear fishing and historically as a polearm. The trident is the weapon of Poseidon, or Neptune, the God of the Sea in classical mythology. The trident may occasionally be held by other mari ...

* Open Live Writer, from Windows Live Writer 2012

2016

*

Collabora Online Collabora Online is an open source online office suite that can be integrated with any web application, it is developed by Collabora Productivity, a division of Collabora. Collabora Online has LibreOffice at its core and allows for collaborativ ...

, from

LibreOffice LibreOffice () is a free and open-source office productivity software suite, a project of The Document Foundation (TDF). It was forked in 2010 from OpenOffice.org, an open-sourced version of the earlier StarOffice. The LibreOffice suite co ...

, Collabora Online is a web-based enterprise ready edition of LibreOffice *

Goanna A goanna is any one of several species of lizards of the genus '' Varanus'' found in Australia and Southeast Asia. Around 70 species of ''Varanus'' are known, 25 of which are found in Australia. This varied group of carnivorous reptiles ranges ...

, from Gecko *

Nextcloud Nextcloud is a suite of client-server software for creating and using file hosting services. Nextcloud provides functionally similar to Dropbox, Office 365 or Google Drive when used with integrated office suite solutions Collabora Online or Onl ...

, from

ownCloud ownCloud is an open-source software product for sharing and syncing of files in distributed and federated enterprise scenarios. It allows companies and remote end-users to organize their documents on servers, computers and mobile devices and w ...

2017

*

Basilisk In European bestiaries and legends, a basilisk ( or ) is a legendary reptile reputed to be a serpent king, who causes death to those who look into its eyes. According to the ''Naturalis Historia'' of Pliny the Elder, the basilisk of Cyrene i ...

, from

Firefox Mozilla Firefox, or simply Firefox, is a free and open-source web browser developed by the Mozilla Foundation and its subsidiary, the Mozilla Corporation. It uses the Gecko rendering engine to display web pages, which implements current ...

. * Bitcoin Cash, from

Bitcoin Core Bitcoin (abbreviation: BTC; sign: ₿) is a decentralized digital currency that can be transferred on the peer-to-peer bitcoin network. Bitcoin transactions are verified by network nodes through cryptography and recorded in a public distrib ...

, supported by the forked implementations Bitcoin ABC, Bitcoin Unlimited and Bitcoin XT. * Unified XUL Platform, from

XUL XUL ( ), which stands for XML User Interface Language, is a user interface markup language developed by Mozilla. XUL is an XML dialect for writing graphical user interfaces, enabling developers to write user interface elements in a manner sim ...

.

2019

* Trino, from Presto.

2021

* White Star, from

Pale Moon Pale Moon is an open-source web browser with an emphasis on customization; its motto is "Your browser, Your way". There are official releases for Microsoft Windows and Linux, as well as contributed builds for various platforms. Pale Moon origi ...

.

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