The FreeSpace-series of games are starfighter-simulators.

Basically, think of flying in the cockpit of an X-Wing from Star Wars, or a jet fighter in space.

The games consist of Descent: FreeSpace – The Great War (aka FS1) and FreeSpace 2 (aka—incredibly enough—FS2). There is also an expansion to FS1 called Silent Threat. FS1 came out in 1998, followed by FS2 in 1999.