This engine can be used as a replacement for commercial or closed engines
Welcome to Enemy Territory: Legacy, an open source project that aims to create a fully compatible client and server for the popular...
A portable game engine for classic first person shooters such as DOOM, Heretic and Hexen.
OpenRW "Open ReWrite" is an un-official open source recreation of the classic Grand Theft Auto III game executable.
Jedi Knight II: Jedi Outcast (Single Player Linux Port).
OpenJK is an effort by the JACoders group to maintain and improve the game engines on which the Jedi Academy (JA) and Jedi Outcast...
Open source implementation of ALIVE engine that powers Oddworld Abes Oddysee and Oddworld Abes Exoddus.
8 Mar 2015)
Homeworld is a real-time strategy computer game, set and played in a 3D space environment.
OpenXcom is an open-source clone of the original UFO: Enemy Unknown (X-Com: UFO Defense in USA), licensed under the GPL and written in C++ / SDL.
A opensource reimplementation of the LBA (Little Big Adventure, aka relentless) game engine.
You know Age of Empires. You know its bugs.
FreeSO (“Free Simulator Online”) is a reimplementation of The Sims Online™’s game engine, using C# and Monogame.
Opensource crossplatform Fallout 2™ engine writen in C++ and SDL.