Epic Space Online, an MMO so epic, it says so right in the title. This indie game was developed by the Alpha Company and is currently available, although it's trying to get voted into the Steam Greenlight program for wider recognition and distribution.
Epic Space Online takes place in a single shared, procedurally generated universe without any borders. Players can vie over territory, mine ore, deploy stations, make ships, trade goods, and even command giant carriers staffed by other players. The devs have promised weekly updates and features to keep things lively.
You can check out the trailer after the break.