FreeSpace 2
There is currently no ongoing official support for FreeSpace 2. However, FreeSpace 2's code base was released as FreeSpace 2 Source Code Project and is actively worked on by the community.
FreeSpace 2 is the sequel to Descent: FreeSpace – The Great War (1998).
Patches
The latest community patch can be downloaded from here. It is a major update of the whole game engine, with ports to Mac and Linux, and among other things greatly improves graphics. The latest installation instructions for Windows, with links to similar instructions for Mac and Linux, are here at the time of this writing. The FSO Installer mentioned on their wiki is currently outdated and can cause problems, so the manual installation instructions are recommended.
Mods
The aforementioned community patch is essential for user made modifications and includes a mod loader. It even allows importing the prequel's campaign and playing it with the community patch.
System Requirements
Useful Links
Hard Light Productions: the driving force behind the community updates.