TX Library is a tiny graphics library for Win32 written in C++.
Orx: Portable Game Engine
Generate ready-to-use disc images for your Sega Dreamcast system !
Gaming library
Open Game Bootstrap
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
A generic 2D engine for any kind of game
Scriptable frontend for media applications.
A very small multi-platform game engine for creating desktop games.
Cross-platform reimplementation of AMOS BASIC (runtime)