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X-tended 2.0 for Terran Conflict makes the game amazing. And look amazing as well. Best graphics I've personally seen in a game. Lots of new features and stuff too. I waited for over a year for 2.0 to come out...but I know it was in development for longer than that. Its biggest mod for X3 I've ever seen though.
Screenshots and details in the link.
My Skyrim website (mods, screenshots, stories and other games I play(ed)