FreeSpace 2 is a 1999 space combat simulation computer game developed by Volition, Inc. as the sequel to Descent: FreeSpace – The Great War. It was completed ahead of schedule in less than a year, and released to great critical acclaim. Engrossing gameplay, excellent sound effects in addition to the inclusion of vocal talent such as Robert Loggia and Ronny Cox led several gaming sites to have proclaimed it as the definitive simulation game for 1999.
The game continues on the story from Descent: FreeSpace, once again thrusting the player into the role of a pilot fighting against the mysterious aliens, the Shivans. While defending the human race and its alien Vasudan allies, the player also gets involved in putting down a rebellion. The game features large numbers of fighters alongside gigantic capital ships in a battlefield fraught with beams, shells and missiles in detailed star systems and nebulae. Free multiplayer games were available via Parallax Online which also ranked players by their statistics. A persistent galaxy was also available as SquadWar for players to fight with each other over territories.
In 2002, Volition released the source code for the game engine under a non-commercial license. This code became the core of the FreeSpace 2 Source Code Project, which continuously improves it and enables new features. In cooperation with the FreeSpace Upgrade Project the game's graphics are kept up to date.  The improved game engine is also used by various mod projects, for example The Babylon Project and Diaspora which are based on the science fiction series Babylon 5 and Battlestar Galactica respectively.