Mayhem

Mayhem is an old Amiga classic, the got its source released a long while back. It has since then been picked up again by a new developer and now runs great on modern systems. It even has some improvements like new levels, new power-ups and other features. If you don't know about Mayhem it's a multiplayer flight-shooter, where you have to keep your ship aloft firing against other players and struggling to stay aloft. It is indeed very fun, so bring out your joysticks and invite your friends.

Four-player splitscreen with a mini-map in the middle. Game-night is saved!