GTK
GTK - The GNOME Toolkit, a flexible GUI library
GTK is a free, open-source widget toolkit for creating graphical user interfaces across Linux, Windows, macOS, and mobile platforms.
Official WebsiteCategory
Frontend
First Release
1998
License
LGPL (v3) with runtime linking
Maintained By
Peter Braam and the GTK team (GNOME project)
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Difficulty
Intermediate 2/3
Solid for C developers; mastering signal handling, theming with CSS, and language bindings adds complexity.