A growing collection of computer games that are freeware, open source or free to play.

The game was initially developed by Microsoft Research and later released under a shared source license and is now maintained / developed by volunteers.

Gameplay relies heavily on good teamwork and forward thinking. Players can fly a variety of craft, striving to destroy enemy team installations and protecting their own. Resource collection figures significantly in the game, since new technology can be expensive and money is usually scarce.

Players can choose between piloting individual fighter, bombers, stealth and scout craft. Players can also choose to fly massive capital ships from carriers to dreadnoughts and missile frigates, all sporting multiple turrets. Several players can man each capital ship, including turret positions.

Battles are usually fought between two teams and each side can have up to 100 players.

Gameplay consists of regular RTS strategies with the major difference that each individual unit is a player. Each team gathers resources using miners and builds bases in different sectors. Reconnaissance is followed by expansion for more resources to fuel the war machine and then either a decisive showdown or a long, drawn out stalemate.