The latest retail patch is v1.02; digital distribution versions already include this.
An unofficial port of Freespace 2 is available here. The installer and the source code of the port itself is available. Keep in mind that the installer is not compatible with GOTY/Sim and non-English version.
FS2Open is an open source port for Windows, OS X and Linux. It features improved graphics, mod support, mutli-platform support, improved mission scripting, lua scripting, optimizations, and various bug fixes.
Community Support for FSOpen (FSO) can be found at Hard-light Productions
FS2Open helps install various popular mods including a port of Descent: FreeSpace – The Great War.
Active development of mods can be found at Hard-Light Productions