RetroArch is a frontend for emulators, game engines and media players.
Orx: Portable Game Engine
Free 32/64/16-bit multi-platform Pascal and Object Pascal compiler
A promising chess program
Old style soccer game with many exciting features
God game: wage war from the stone age to the future
A cross-platform interpreter for many point-and-click adventure games
Remake of the classic Caesar III game
Android, DOS, FirefoxOS, Linux, MacOS and Windows all in one..
Open Game Bootstrap
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
c# lua bind with unity3d project for game development
Cross platform Game Creation Software
A puzzle game of rules acting upon rules. Create the desired pattern.
Original turn-based strategy wargame & boardgame
The solution to all your problems
Very Powerfull Crossplatform Qt Based Music Note Editor[Still Planing]
Nurikabe, a great game.
A desktop OS designed for touchscreen phones and tablets!
Java based Open source Voxel Engine for RTS games