A retro game engine for Python
3D game engine/framework in C, with Luajit and Python bindings now
Injectable LUA scripting system, SDK generator, live property editor
A modern, cross-platform Quake game engine based on FitzQuake.
GemRB is a portable open-source implementation of the Infinity Engine
A cell-based puzzle game featuring classic and completely new puzzles
2D game development library for Ruby and C++
Javascript library for making tile based games
2D Game Engine
A cross platform Lua based game engine
A cross-platform 2D game engine
scriptable game engine with built-in support for 2D graphics and sound
Flexible and easy-to-use 2d game engine
Multi-platform game engine similar to old Megaman with a stage editor
A generic 2D engine for any kind of game
Java game engine for shoot 'em ups, using Java2D.
Cross-platform 2D game engine
Gomoku Game: Playing with Computer