Rules (mlfb.info/smf/index.php?board=329.0) (Gridiron Franchise).. 24-team franchise league featuring special provisions for holding onto your real-life franchises' QB, K, and punters. Features IDP and unique scoring system to focus on yards gained, field control, and individual contributions (Bill Jamesian per say).
League has contracts in a fairly simple manner (no buyouts or extensions), a 4-round entry draft each season, and it starts out with a draft to pick up players from the other 8 remaining NFL franchise. Focus is on long-term management so there is no FA during the season, deep rosters, a salary cap, salary floor, and limited amount of trades after the draft (2). All moves are handled on message board.
League is free, SIGN-UP SHEET (mlfb.info/smf/index.php?topic=7022.0) and is on Fantrax