BZFlag, a tank FPS where you can pick up flags that give you certain extra abilities. It ran originally on Silicon Graphics workstations (at least that's were

BZFlag, a tank FPS where you can pick up flags that give you certain extra abilities. It ran originally on Silicon Graphics workstations (at least that's were I encountered it), but it was based on the Battle Zone arcade game. There was a PC port. Snipes, a "shoot the bugs (and each other) network game for Novell networks back in the mid 1980s.