Solaris Is a total conversion mod for FreeSpace Open Source which basically is for FreeSpace and FreeSpace 2. You need a copy of FreeSpace 2 form GOG or Steam.

Install the Knossos Installer which will take care of the mods...

Solaris:
Solaris Total Conversion

Knossos Installer:
Knossos

This Is basically how it works, although this Is a bit dated...
Theres a lot of cool mods and gameplay.




Hard Light Productions:
Hard Light Productions Home site

Intro to FreeSpace Open Source...




Solaris...



Red







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