Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
3D C++ Game Engine - yet another open source game engine
Graphical hook for a D3D9-D3D12, OpenGL and Vulkan based games
Improved version of the X-Ray Engine, the game engine
A 2D game engine and level editor
KlayGE is a cross-platform open source game engine
MAME Android Emulator.
A cross-platform 2D game engine
Easy fine console input/output for java
Game backup loader for Wii and vWii
Game engine for playing tomb raider 1 - 5 levels.
scriptable game engine with built-in support for 2D graphics and sound
EE Keeper is a saved game editor for Baldur's Gate Enhanced Edition.
The Atomic Game Engine is a multi-platform 2D and 3D engine
Bot for id Software's Wolfenstein 3D
Realtime 3D engine for game development
2D ARPG Engine
Source code of a text adventure game.
Advanced rhythm game for Windows, Linux and OS X
A public domain cross platform 3D game
Highly portable Gameboy Color emulator
Reenactment of the classic Atari 2600 game
Multi-platform game engine similar to old Megaman with a stage editor
Android, DOS, FirefoxOS, Linux, MacOS and Windows all in one..