Widget toolkitA widget toolkit, widget library, GUI toolkit, GUI framework, UI framework, or UX library is a library or a collection of libraries containing a set of graphical control elements (called widgets) used to construct the graphical user interface (GUI) of programs. Most widget toolkits additionally include their own rendering engine.
Tcl (programming language)Tcl (pronounced as an acronym, , like tickle, or as an initialism, , like T-C-L; originally Tool Command Language) is a high-level, general-purpose, interpreted, dynamic programming language. It was designed with the goal of being very simple but powerful. Tcl casts everything into the mold of a command, even programming constructs like variable assignment and procedure definition.
Graphical user interfaceA graphical user interface, or GUI, is a form of user interface that allows users to interact with electronic devices through graphicalicons and visual indicators such as secondary notation. In many applications, GUIs are used instead of text-based UIs, which are based on typed command labels or text navigation. GUIs were introduced in reaction to the perceived steep learning curve of command-line interfaces (CLIs), which require commands to be typed on a computer keyboard.
Microsoft WindowsComputer operating systemOperating systemWindows is a proprietaryoperating system developed by Microsoft. Windows is grouped into families that cater to particular sectors of the computing industry – Windows for personal computers, Windows Server for servers, and Windows IoT for embedded systems.
Graphical widgetIn a graphical user interface (GUI), a graphical widget (also graphical control element or control) is an element of interaction, such as a button or a scroll bar. Controls are software components that a computer user interacts with through direct manipulation to read or edit information about an application. User interface libraries such as Windows Presentation Foundation, Qt, GTK, and Cocoa, contain a collection of controls and the logic to render these.
LinuxFamily of Unix-like operating systems that use the Linux kernelOperating systemLinux ( ) is a family of free and open-source softwareUnix-like operating systems based on the Linux kernel, which was first released on 17 September 1991 by Linus Torvalds.
Software licenseA software license is a legal instrument governing the use or redistribution of software. Since the 1970s, software copyright has been recognized in the United States. Despite the copyright being recognized, most companies prefer to sell licenses rather than copies of the software because it enables them to enforce stricter terms on redistribution.
Free and open-source softwareFree and open-source software (FOSS) is software available under a license that gives users the right to use, share, modify, and distribute the software — modified or not — to everyone and provides the means to exercise those rights using the software's source code. FOSS is an inclusive umbrella term encompassing free software and open-source software.
UnixUnix ( , YOO-niks; trademarked as UNIX) is a family of multitasking, multi-user computer operating systems that derive from the original AT&T Unix, the development of which started in 1969 at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and others.
MacOSmacOS (previously OS X and originally Mac OS X) is a proprietary Unix operating system, derived from OPENSTEP for Mach and FreeBSD, which has been marketed and developed by Apple since 2001. It is the current operating system for Apple's line of Mac computers. As of April 2026, within the market of desktop and laptop computers, it is the second most widely used desktop OS, after Microsoft Windows and ahead of all Linux distributions, including ChromeOS and SteamOS.
BSD licensesBSD licenses are a family of permissive free software licenses, imposing minimal restrictions on the use and distribution of covered software. This is in contrast to copyleft licenses, which have share-alike requirements. The original BSD license was used for its namesake, the Berkeley Software Distribution (BSD), a Unix-likeoperating system. The original version has since been revised, and its descendants are referred to as modified BSD licenses.
Cross-platform softwareWithin computing, cross-platform software (also called multi-platform software, platform-agnostic software, or platform-independent software) is computer software that is designed to work in several computing platforms.*As an Amazon Associate I earn from qualifying purchases.