RTSish Game Engine
An isometric arcade-style game of skill, puzzles and exploration
3D puzzle game based on Kula World and Cubosphere
A free 3D game engine to create games and realtimes scenes for Windows
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
A PICO-8 demake of the SCUMM engine
A cross platform Lua based game engine
Cross-platform 2D and 3D game engine
Planimeter Game Engine 2D - LÖVE-based game engine for Lua
3D-Accelerated open-source DOOM engine
EDGE is an advanced DOOM source port
Game engine for playing tomb raider 1 - 5 levels.
2D ARPG Engine
Babylon 5 in Homeworld 2!
A space game in the Hoshikaze 2250 universe, built on the NAEV engine
A free engine for C&C Tiberian Dawn