This article provides a list ofwidget toolkits (also known asGUI frameworks), used to construct thegraphical user interface (GUI) of programs, organized by their relationships with variousoperating systems.

• Mac OS X usesCocoa. Mac OS 9 and Mac OS X used to useCarbon for32-bit applications.
• TheWindows API used inMicrosoft Windows. Microsoft had the graphics functions integrated in the kernel until 2006^[1]
• TheHaiku operating system uses an extended and modernised version of theBe API that was used by its predecessorBeOS. Haiku is expected to drop binary and source compatibility with BeOS at some future time, which will result in a Haiku API.

• TheX Window System contains primitive building blocks, calledXt or "Intrinsics", but they are mostly only used by older toolkits such as:OLIT,Motif andXaw. Most contemporary toolkits, such asGTK orQt, bypass them and useXlib orXCB directly.
• TheAmiga OSIntuition was formerly present in the AmigaKickstart ROM and integrated itself with a medium-high level widget library which invoked theWorkbench Amiga nativeGUI. Since Amiga OS 2.0, Intuition.library became disk based and object oriented. Also Workbench.library and Icon.library became disk based, and could be replaced with similar third-party solutions.
• Since 2005, Microsoft has taken the graphics system out of Windows' kernel.^[2]

• BOOPSI (Basic Object Oriented Programming System for Intuition) was introduced with OS 2.0 and enhanced Intuition with a system of classes in which every class represents a single widget or describes an interface event. This led to an evolution in which third-party developers each realised their own personal systems of classes.
• MUI: object-oriented GUI toolkit and the official toolkit forMorphOS.
• ReAction: object-oriented GUI toolkit and the official toolkit forAmigaOS.
• Zune (GUI toolkit) is an open source clone of MUI and the official toolkit forAROS.

• Cocoa - used inmacOS(see alsoAqua). As a result of macOS'OPENSTEP lineage, Cocoa also supports Windows, although it is not publicly advertised as such. It is generally unavailable for use by third-party developers.^{[citation needed]} An outdated and feature-limited open-source subset of Cocoa exists within theWebKit project, however; it is used to renderAqua natively inSafari (web browser) for Windows.^{[citation needed]} Apple'siTunes, which supports both GDI and WPF, includes a mostly complete binary version of the framework as "Apple Application Support".^{[citation needed]}
• Carbon - the deprecated framework used inMac OS X to port“classic” Mac applications and software to theMac OS X.
• MacApp, the framework for theClassic Mac OS by Apple.
• PowerPlant, the framework for theClassic Mac OS by Metrowerks.

• TheMicrosoft Foundation Classes (MFC), a C++ wrapper around the Windows API.
• TheWindows Template Library (WTL), a template-based extension toATL and a replacement ofMFC
• TheObject Windows Library (OWL),Borland's alternative to MFC.
• TheVisual Component Library (VCL) isEmbarcadero's toolkit used inC++Builder andDelphi. It wraps the native Windows controls, providing object-oriented classes and visual design, although also allowing access to the underlying handles and other WinAPI details if required. It was originally implemented as a successor toOWL, skipping the OWL/MFC style of UI creation, which by the mid-nineties was a dated design model.^[3]
• Windows Forms (WinForms) is Microsoft's.NET set of classes that handle GUI controls. In the cross-platformMono implementation, it is an independent toolkit, implemented entirely inmanaged code (not wrapping the Windows API, which doesn't exist on other platforms).^[4] WinForms' design closely mimics that of theVCL.
• TheWindows Presentation Foundation (WPF) is the graphical subsystem of the.NET Framework 3.0. User interfaces can be created in WPF using any of theCLR languages (e.g.C#) or with theXML-based languageXAML.Microsoft Expression Blend is a visual GUI builder for WPF.
• TheWindows UI Library (WinUI) is the graphical subsystem ofuniversal apps. User interfaces can be created in WinUI usingC++ or any of the.NET languages (e.g.,C#) or with theXML-based languageXAML.Microsoft Expression Blend is a visual GUI builder that supports WinUI.

Note that theX Window System was originally primarily for Unix-like operating systems, but it now runs on Microsoft Windows as well using, for example,Cygwin, so some or all of these toolkits can also be used under Windows.

• Motif used in theCommon Desktop Environment.
• LessTif, anopen source (LGPL) implementation of Motif.
• MoOLIT, a bridge between the look-and-feel of OPEN LOOK and Motif
• OLIT, an Xt-basedOPEN LOOK intrinsics toolkit
• Xaw, theProject Athena widget set for theX Window System.
• XView, aSunView compatible OPEN LOOK toolkit

• Elementary,open source (LGPL), a part of theEnlightenment Foundation Libraries.
• GTK,open source (LGPL), primarily for the X Window System, ported to and emulated under other platforms; used in theGNOME,Rox,LXDE andXfce desktop environments. The Windows port has support for native widgets.
• IUP,open source (MIT), a minimalist GUI toolkit in ANSI C for Windows, UNIX and Linux.
• Tk,open source (BSD-style), a widget set accessed fromTcl and other high-level script languages (interfaced inPython asTkinter).
• XForms, the Forms Library forX
• XVT, Extensible Virtual Toolkit

• CEGUI,open source (MIT License), cross-platform widget toolkit designed forgamedevelopment, but also usable for applications and tool development. Supports multiple renderers and optional libraries.
• FLTK,open source (LGPL), cross-platform toolkit designed to be small and fast.
• FOX toolkit,open source (LGPL), cross-platform toolkit.
• GLUI, a very small toolkit written with theGLUT library.
• gtkmm, C++ interface for GTK
• Juce provides GUI and widget set with the same look and feel in Microsoft Windows, X Windows Systems, macOS and Android. Rendering can be based on OpenGL.
• Qt,open source (GPL,LGPL) with optional proprietary/commercial licensing, available under Unix and Linux (with X11 or Wayland), Windows (Desktop, CE and Phone 8), macOS, iOS, Android, BlackBerry 10 and embedded Linux; used in theKDE,Trinity,LXQt, andLumina desktop environment, it's also used in Ubuntu'sUnity shell.
• Rogue Wave Views (formerlyILOG Views) provides GUI and graphic library for Windows and the main X11 platforms.
• TnFOX,open source (LGPL), a portability toolkit.
• U++ is anOpen-source application framework bundled with anIDE (BSD license), mainly created forWin32 andUnix-like operating system (X11) but now works with almost anyoperating systems.
• wxWidgets (formerly wxWindows),open source (relaxedLGPL), abstract toolkits across several platforms for C++,Python,Perl,Ruby andHaskell.
• Zinc Application Framework, cross-platform widget toolkit.

• Tkinter,open source (BSD) is a Python binding to theTk GUI toolkit. Tkinter is included with standard GNU/Linux, Microsoft Windows and macOS installs of Python.
• Kivy,open source (MIT) is a modern library for rapid development of applications that make use of innovative user interfaces, such as multi-touch apps. Fully written in Python with additional speed ups inCython.
• PySide,open source (LGPL) is a Python binding of the cross-platform GUI toolkitQt developed byThe Qt Company, as part of the Qt for Python project.
• PyQt,open source (GPL and commercial) is another Python binding of the cross-platform GUI toolkitQt developed by Riverbank Computing.
• PyGTK,open source (LGPL) is a set of Python wrappers for the GTK graphical user interface library.
• wxPython,open source (wxWindows License) is a wrapper for the cross-platform GUI APIwxWidgets for the Python programming language.

• Adobe Flash allows creating widgets running in most web browsers and in several mobile phones.
• Adobe Flex provides high-level widgets for building web user interfaces. Flash widgets can be used in Flex.
• Flash and Flex widgets will run without a web browser in theAdobe AIR runtime environment.
• Adobe AIR allow the creation ofrich Internet applications based upon Flash

• Fyne,open source (BSD) is inspired by the principles of Material Design to create applications that look and behave consistently across Windows, macOS, Linux, BSD, Android and iOS.

• GladeXML withGTK
• XAML withSilverlight orMoonlight
• XUL

General

• jQuery UI
• MooTools
• Qooxdoo Could be understood as Qt for the Web
• Script.aculo.us

RIAs

• Dojo
• Ext JS (formerlySencha Touch)
• Telerik Kendo UI
• Webix
• WinJS
• React Native

Full-stack framework

• Echo3
• SproutCore
• Telerik UI for ASP/PHP/JSP/Silverlight
• Vaadin - Java

Resource-based

• Google Web Toolkit (GWT)
• FBML Facebook Markup Language

No longer developed

• YUI (Yahoo! User Interface Library)

• Raphaël is a JavaScript toolkit for SVG interfaces and animations

• Gtk#, C# wrappers around the underlyingGTK andGNOME libraries, written inC and available on Linux, MacOS and Windows.
• Windows Forms. There is an original Microsoft's implementation that is a wrapper around theWindows API and runs on windows, and Mono'salternative implementation that is cross platform.

• TheAbstract Window Toolkit (AWT) isSun Microsystems' original widget toolkit for Java applications. It typically uses another toolkit on each platform on which it runs.
• Swing is a richer widget toolkit supported sinceJ2SE 1.2 as a replacement for AWT widgets. Swing is a lightweight toolkit, meaning it does not rely on native widgets.
• Apache Pivot is an open-source platform for building rich web applications in Java or any JVM-compatible language, and relies on the WTK widget toolkit.
• JavaFX andFXML.
• TheStandard Widget Toolkit (SWT) is a native widget toolkit for Java that was developed as part of theEclipse project. SWT uses a standard toolkit for the running platform (such as the Windows API, macOS Cocoa, or GTK) underneath.
• Codename One originally designed as a cross platform mobile toolkit it later expanded to support desktop applications both through JavaSE and via a JavaScript pipeline through browsers
• java-gnome provides bindings to theGTK toolkit and other libraries of theGNOME desktop environment
• Qt Jambi, the official Java binding toQt from Trolltech. The commercial support and development has stopped^[5]
• ZK - A Java Web framework for building rich Ajax and mobile applications

• FireMonkey or FMX is a cross-platform widget and graphics library distributed withDelphi andC++Builder since version XE2 in 2011. It has bindings for C++ through C++Builder, and supports Windows, macOS, iOS, Android, and most recently Linux. FireMonkey supports platform-native widgets, such as a native edit control, and custom widgets that are styled to look native on a target operating system. Its graphics are GPU-accelerated and it supports styling, and mixing its own implementation controls with native system controls, which lets apps use native behaviour where it's important (for example, forIME text input.)
• IP Pascal uses a graphics library built on top of standard language constructs. Also unusual for being a procedural toolkit that is cross-platform (no callbacks or other tricks), and is completely upward compatible with standard serial input and output paradigms. Completely standard programs with serial output can be run and extended with graphical constructs.
• LazarusLCL (forPascal,Object Pascal andDelphi viaFree Pascal compiler), a class library wrappingGTK+ 1.2–2.x, and the Windows API (Carbon, Windows CE and Qt4 support are all in development).
• fpGUI is created with theFree Pascal compiler. It doesn't rely on any large 3rdParty libraries and currently runs on Linux, Windows, Windows CE, and Mac (via X11). A Carbon (macOS) port is underway.
• CLX (Component Library for Cross-platform) was used withBorland's (nowEmbarcadero's)Delphi,C++ Builder, andKylix, for producing cross-platform applications between Windows and Linux. It was based onQt, wrapped in such a way that its programming interface was similar to that of theVCL toolkit. It is no longer maintained and distributed, and has been replaced withFireMonkey, a newer toolkit also supporting more platforms, since 2011.

• GNUstep andOpenStep
• Cocoa andCocoa Touch

• Flutter (software) is an open-source and cross platform framework created by Google.

• Cocoa Touch is a framework created by Apple to build applications foriOS,iPadOS andtvOS.

• Shoes (GUI toolkit) is a cross platform framework for graphical user interface development.

• WINGs
• LiveCode
• Wt
• Immediate Mode GUI

• List of platform-independent GUI libraries

• Widget toolkits
• Lists of software

• Webarchive template wayback links
• Articles with short description
• Short description is different from Wikidata
• Use dmy dates from April 2020
• All articles with unsourced statements
• Articles with unsourced statements from July 2022