Reds, Astros and Cubs are all available. Currently using version 6.5 You must own the game to be in the league. Now in the middle of our 6th season (2009) with a good almost half of our original GM's still in the league. If you want a fun, competitive and friendly league, look no further.
http://www.umbl.ootp-online.com/
If interested apply here :
http://www.umbl.ootp-online.com/forum/index.php?topic=10.0