GitHub repository: unnamed-mmo/lxgui
Primary language: C++
Description: Portable, real time, modular and data-driven GUI C++ library. The GUI can be created either directly in C++, or by using the data-driven "add-on" system similar to World of Warcraft (XML for layout, Lua for logic). It relies on keyboard and mouse input (no joystick or touch screen capability). SFML and OpenGL rendering back ends are provided.