GTK+
Open SourceGTK (formerly GTK+), or the GIMP Toolkit, is a free and open-source cross-platform widget toolkit for creating graphical user interfaces (GUIs). It's written in C and offers bindings for numerous other programming languages, making it highly versatile for building desktop applications.
Key Features
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Excellent cross-platform support for Linux, Windows, and macOS.
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Mature and stable toolkit with a long history of development.
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Comprehensive set of widgets for building diverse interfaces.