Tank Arena

Tank Arena is an arcade game from 1997 that just got it's source code released, qualifying it for a mention here. :) It's playable against another player on the same computer in either a deathmatch, race, capture the flag or co-op play. There also seems to be a bunch of single-player levels to tackle alone. You can drive tanks, chopper and planes and there are several different ones to use, as well as four different worlds, a complete map editor and joystick support!

A few screens from Tank Arena, showing classic pixel art and splitscreen play!