Multi-threaded 2D Renderer licensed under the Mozilla Public License
2D XNA Game Engine
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 mobile tower 3D tower defense/defend the flag game
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.
A game development kit for Sifteo Cubes.
2D Game Engine, based on OpenGL and focused on Isometric Games
A graphics engine + toolkit.