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Agar is a modern open-source, cross-platform toolkit for graphical applications implemented in C, C++, Perl and Ada (with bindings to other languages in development). Designed for ease of integration, it follows the philosophy of building the GUI around the application, and not the other way around. The Agar GUI library is designed to work under almost any platform that provides a graphic display and input device. Beginning with the 1.4 series, Agar can be built without any dependencies, and has even been used on embedded devices without any operating system.

The driver interface introduced in the 1.4 series allows easier porting to new platforms and graphics systems. Like traditional GUI toolkits, Agar can interface with an underlying window system (i.e., Xlib, Windows API), but Agar can also provide its own window manager if there is no underlying window system (as used, for example, with the SDL direct-video driver, dumb framebuffers, low-level LCD controllers). Unlike most other GUI toolkits, Agar takes maximum advantage of hardware graphics acceleration where available. When compiled with optional threads support, the Agar API is entirely thread-safe.
The base Agar library is intended to be as general and compact as possible. Separate libraries extending Agar in more specialized applications include Agar-MATH (math extensions), Agar-VG (vector graphics), Agar-RG (feature-based graphics), Agar-DEV (developer tools) and FreeSG (scene-graph and computational geometry).

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. Agar is stable, well-maintained and has been growing organically since early 2002. The Agar project is sponsored and hosted by Csoft.net Hosting.