A retro game engine for Python
3D game engine/framework in C, with Luajit and Python bindings now
GemRB is a portable open-source implementation of the Infinity Engine
Injectable LUA scripting system, SDK generator, live property editor
An isometric arcade-style game of skill, puzzles and exploration
SDL based generic 2D game engine
a UCI chess engine
2D Game Engine
A cross platform Lua based game engine
A cross-platform 2D game engine
Real-time RPG for PC/tablet/phone; multiple quests and random dungeons
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
Mahasona engine is an open source game engine.
A generic 2D engine for any kind of game
Open source, moddable game engine for the "Polygon Love 2" game
Java game engine for shoot 'em ups, using Java2D.
Framework for a graphical point and click adventure game in Java