Cross-platform C framework very compact libraries and tools.
A 2D Adventure Game & Engine
A generic 2D engine for any kind of game
Multi-threaded 2D Renderer licensed under the Mozilla Public License
Library for creating turn-based games with simultaneous moves.
TurboSphere is an easy to learn and powerful JS based game engine.
A 2D game engine base on OpenGL and SDL,support for Windows & Linux
Take the chess graphism, and use it with a chess engine.
Pygrid is an open-source and cross-platform pygame/python 2D engine.
A world editor for HGE game engine written in python and uses OpenGL.
A multiplatform game engine for interactive fiction experiences
A 3D, fully concurrent game engine
A cross-platform game framework based on OpenGL and GObject.
A retro style video game engine for RPGs and adventure games.
2D Game Engine, based on OpenGL and focused on Isometric Games
3D game engine for C and C++
A graphics engine + toolkit.
A very small multi-platform game engine for creating desktop games.
Little game background framework in java.