A widget toolkit, widget library, GUI toolkit, 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 of programs.

Collection of tools for developers.

Java toolkit for graphical interfaces.

Toolkit for building graphical interfaces.

Java toolkit for graphical interfaces.

Toolkit for natural language processing.

Collection of tools for databases.

(stylized as dōjō toolkit) an open-source modular JavaScript library (or more specifically JavaScript toolkit) designed to ease the rapid development of cross-platform, JavaScript/Ajax-based applications and web sites.