Another one from me, it's the Hitchhiker's Guide to the Galaxy mod!
It has 7 playable major races, a new Class of starbase: Artificial Planets, new modules for that starbase, new Random Events and some new Engines, including the Infinite Improbability Drive.
It can be downloaded from the library or a version including video can be downloaded from the website at TBSModder
. On TBSM there is also a forum for the mod.
Here are some screenshots: