About Agar

Agar (or libAgar) is a cross-platform GUI toolkit. Agar provides a base framework and a set of widgets from which applications can be built.

Agar applications work natively under at X11, Windows, MacOS X, SDL and others. Agar takes advantage of hardware acceleration when it is available. Agar may also attach to an existing SDL or OpenGL context and operate as a self-contained windowing GUI for the application. Agar can be compiled with zero dependencies (although FreeType is recommended for good font quality). Agar is compact, efficient and fully thread-safe.

Deriving or creating new widgets is simple. 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, Agar-Math, Agar-VG and Agar-Dev.

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. The best available version is 1.5.0.


07/31/2017 07/31/2017:
The Agar repository is now mirrored on Github at:
03/25/2016 03/25/2016:
New stable release: agar-1.5.0 (A mild Breeze upon the Brow of the Dead)
[Release Notes]
04/08/2014 04/08/2014:
The Subversion repository is now accessible via
05/22/2013 05/22/2013:
The MinGW and Visual Studio Installation Guides have been updated.
07/29/2012 07/29/2012:
The Online Manual now displays images; several cosmetic fixes were also applied.
03/20/2011 03/20/2011:
New stable release: agar-1.4.1 (Landscapes of Frozen Methane)
[Release Notes]

[ Previous announcements ]

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