SGUI
A simple, small, cross platform GUI library in plain C89
SGUI is a small, simple, cross platform GUI library written in plain C89.
It has a set of widgets, dialogs and supports OpenGL and Direct3D context creation, also including embedded rendering widgets within a window.
SGUI has so far been successfully tested on various GNU/Linux distros on x86 and x86_64, as well as Windose operating systems from Windows 98 up to Windows 7.