Baseball
Action Baseball League, American Stat-o-matic Baseball League, Apartment League Baseball, APBA Japanese Baseball, APBL Baseball League, ASBL Strat-O-Matic Baseball League, Baseball Mogul, Big League Baseball Exchange, Century League, Diamond Mind Baseball
Boxing
The International Professional Boxing Association, WEBL Home Page, Xtreme Fantasy Boxing League
Football
Cutthroat Fantasy Football, Dedicated Football League, Index Pro Football, LHFA, National Fantasy Football League, PC Football, Roll Bowl, Sim Football - The Aussie Rules Game for the Conno, Smash Mouth Football League, Spring Football League
Design Depot
Makers of baseball and basketball board games and computer simulations.
Fantasy Soccer 93
Fantasy soccer tournament with newspaper named "Gazzetta del Fantasport" for news and comments. Based out of Italy.
Stable Wars
Fantasy wrestling; with $6 million, build a stable of 7 wrestlers from the WWE.
The Sports Attic
Computer simulated sports leagues for football, baseball and basketball. Annual dues required.
WhatIfSports.com
Free sports simulations. Play past or future games in NCAA basketball, NBA, MLB, and NFL.