Agar (or libAgar) is a cross-platform GUI toolkit. Agar provides a base framework and a set of widgets from which graphical applications can be built which run natively under X11, Windows, MacOS X, SDL and others. Agar takes advantage of texture and GPU acceleration wherever available. Agar can also attach to an existing framebuffer, SDL or OpenGL context and operate as a self-contained window-manager. Agar can be compiled with no dependencies (though FreeType is recommended). The API is thread-safe unless documented otherwise.

The set of widgets built into the library are intended to meet the most common needs of applications, but Agar's class registration interface allows new widgets to be deployed quickly. Examples of separate libraries which implement Agar widgets for specific fields include FreeSG, Edacious, ag_math, ag_vg and ag_dev.

Agar is also extensible at the low-level. The low-level API is fully documented (and provides bindings to multiple languages), such that modular drivers can be written which enable Agar applications to work seamlessly under many platforms graphics systems without any changes at the application code level.

Agar is free software. Its source code is freely usable and re-usable by everyone under a BSD license, which allows use in commercial applications free of charge (commercial support is also available). The best available version is 1.5.0.

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