Interesting that you just revived a thread that's been dead for nearly eight months...
In any case, I recently installed these cool games on my FreeBSD workstation at home but if you have DRI working on your Linux or FreeBSD machines these open-source 3D games are a lot of fun:
neverball and neverputt - tilt a board to roll a ball through an obstacle course; also 3D putt
gl-117 - flight simulator type game