TrekMUSH: Among the Stars
ATS is a MUSH (Multi-User Shared Hallucination is the most common term), a variant of the MU* style of games. These are MMO's before there were MMO's. They're text-based, free, and have incredible gameplay.
Unlike typical RPG's done through chat sessions and such, the MUSH is always running. You can drop in, day or night, and play for a while. There are scheduled events, of course, but the story keeps going.
Anyway, ATS has been around since the early 90's. It has some remarkable coded systems - the whole ASpace concept is just insane. But it also has a lot of depth that opens the door for all kinds of role-playing.
I've been on and off of there over the years as a player, and now I'm back again. I'd be happy to help anyone get started. Look for a Trill named Novi in-game. All you need is a MU* client - I use Gammon's MUSHclient.
Here are some necessary details:
The address: ats.trekmush.org:1701
Gammon's MUSHclient: http://www.gammon.com.au/mushclient/mushclient.htm
The wiki: http://wiki.trekmush.org/index.php/Main_Page