Allegiance

Allegiance is a team-oriented online multiplayer space combat simulation with real-time strategy elements. Allegiance distinguishes itself by having a strategy interface that demands teamwork in order to accomplish anything. This game offers a multitude of gameplay modes with up to six teams. The most popular mode is the two-team conquest mode. In this mode, each team has a designated commander who oversees the asteroid mining operation, invests in the tech tree, buys and constructs new bases and commands the team in a semi-RTS like fashion from an overhead 3D map.

download: http://freeallegiance.org/