The Adventures of Brandywine & Baldwin is a small adventure game with the two heroes Brandywine and Baldwin exploring the universe and beyond to get back to Earth.
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.