What is "starsiege"

Starsiege is a mecha-style vehicle simulation game developed by Dynamix and released in 1999. Starsiege is set in the Metaltech/Earthsiege universe, which contains its predecessors Earthsiege (1994), Battledrome (1995), and Earthsiege 2 (1996). This universe also includes action game Hunter Hunted (1996), strategy games Mission Force: Cyberstorm (1997) and Cyberstorm 2: Corporate Wars (1998). It also includes the sequels Starsiege: Tribes and all subsequent Tribes titles. In 2015, this game and the rest of the Metaltech/Tribes series was released as freeware by Hi-Rez Studios, but Battledrome and the Cyberstorm series, were not.