GTK
Abbreviation · Open Source
Definitions
The GIMP Toolkit — a cross-platform widget toolkit for creating graphical user interfaces, originally developed for GIMP and now the foundation of the GNOME desktop environment. Written in C with bindings for many languages.
In plain English: A toolkit for building desktop applications with buttons, menus, and windows — the standard way to make apps for the GNOME Linux desktop.
Example: "GTK apps look right at home on GNOME but stick out like a sore thumb on KDE."