In the 1980s, there was a command-based Trek game called Begin. It went through a couple updates, but recently, Tom Nelson (the original programmer) released as a Windows port with an updated, smoothed GUI.
The game is a lot of fun. It reminds me a lot of the combat of TOS (and it really puts you in the shoes of the show when you manually give commands such as "course 180 degrees, warp 8.0" or "fire all phasers, 10-degree beam"). The Federation, Klingons, Romulans, and Orions are flyable, and there are multiple classes of ships for each race.
http://www.starfleetproject.com/Hope people enjoy this!
Edit: Sorry if this thread is intended for things related to modeling only, just let me know!