Solarus is a free and open-source Action-RPG game engine, licensed under GPL, and written in C++.
Arx Libertatis is a source port based on the publicly released Arx Fatalis source code.Genre: Role-playing, Action
id Tech 4, popularly known as the Doom 3 engine, is a game engine developed by id Software and first used in the video game Doom 3.Genre: Action
The Doom engine, also known as id Tech 1, is the game engine that powers the id Software games Doom and Doom II: Hell on Earth.Genre: Action
The Quake engine is the game engine developed by id Software to power their 1996 video game Quake.
id Tech 2, popularly known as the Quake II engine, is a game engine developed by id Software for use in their games, most notably Quake II.
Dune Legacy is an effort by a handful of developers to revitalize the first-ever real-time strategy game.Genre: Strategy
Nuvie, pronounced 'New-Vee' is an open sourced game engine for playing Origin's games Ultima 6, Martian Dreams and Savage Empire on...Genre: Role-playing
Iris 2.0 is a cross-platform open-source 2D/3D client for playing the MMORPG Ultima Online on FreeshardsGenre: Role-playing
Pentagram is a project aiming to create an Ultima 8 engine for use on modern operating systems, including Linux, Mac OS X and Windows.Genre: Role-playing