FOnline is a client-server isometric game engine, intended for developing multiplayer and singleplayer games.
Opensource crossplatform Fallout 2™ engine writen in C++ and SDL.
Code and bugfixes for Instant Kingdom's Notrium, a topdown survival game
The Torque Game Engine, or TGE, is a computer game engine originally developed by Dynamix for the 2001 first-person shooter Tribes 2.
MonoGame is an open source implementation of the Microsoft XNA 4.
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.