OpenArena is a community-produced deathmatch FPS based on GPL idTech3 technology
Game Downloader is a small open source download client with a server side library of games that are open source, indie or freeware.
If you ever played Battlefield 2 then you’ll instantly find Battlefield Play4Free familiar. Play4Free is essentially a reboot of Battlefield 2, except it runs in your browser and looks slightly better.
is a 3D real-time strategy game.
Turn-based tactical strategy game with a high fantasy theme.
First person shooter.
Civilization in your browser
is an Arena First Person shooter.