A free racing game based on the now closed-source Tux Racer
Open Racer is going to be a 3d gaming engine based upon what originally was called Tux R acer, originally written by Jasmin Patry.
Battlemech is a game in which you steer a mech from a top-down view in various arenas. A lot of weapons and powerups are available. It is meant to be played on a LAN, but you can play against bots, too (though the bots don't score). It is based on an advanced version of the Quake engine and written in QuakeC.