The Openwall Project is a source for various software, including Openwall GNU/*/Linux (Owl), a security-enhanced

Linux distribution A Linux distribution (often abbreviated as distro) is an operating system made from a software collection that includes the Linux kernel and, often, a package management system. Linux users usually obtain their operating system by downloading on ...

designed for servers. Openwall patches and security extensions have been included into many major

s. As the name implies, Openwall GNU/*/Linux draws

source code In computing, source code, or simply code, is any collection of code, with or without comment (computer programming), comments, written using a human-readable programming language, usually as plain text. The source code of a Computer program, p ...

and design concepts from numerous sources, most importantly to the project is its usage of the

Linux kernel The Linux kernel is a free and open-source, monolithic, modular, multitasking, Unix-like operating system kernel. It was originally authored in 1991 by Linus Torvalds for his i386-based PC, and it was soon adopted as the kernel for the GNU ...

and parts of the GNU userland, others include the BSDs, such as

OpenBSD OpenBSD is a security-focused operating system, security-focused, free and open-source, Unix-like operating system based on the Berkeley Software Distribution (BSD). Theo de Raadt created OpenBSD in 1995 by fork (software development), forking N ...

for its OpenSSH suite and the inspiration behind its own Blowfish-based

crypt A crypt (from Latin '' crypta'' " vault") is a stone chamber beneath the floor of a church or other building. It typically contains coffins, sarcophagi, or religious relics. Originally, crypts were typically found below the main apse of a ...

for password hashing, compatible with the OpenBSD implementation.

Public domain software

The Openwall project maintains also a list of algorithms and

source code In computing, sou