The Retribution Engine is designed for first person shooter games on Windows PCs using OpenGL and OpenAL. It is supplied with a range of games and levels and includes fully featured level and model editors. The game and tools also run on Linux using wine/bottles.
OpenArena is a 3d game creation engine. It is a rendering system that can be used for more than just games but it is targeted at games. The basic use being create some game media textures models maps and config files for physics and rules.
An extensible framework for distributed computing on P2P grids. We support peaceful free and open research and build an internet supercomputer. We render movies, solve Eternity puzzles, predict climate and improve a ~30 GHz cluster of clients.