Brave New World
Brave New World, Delta World, Steve Crow's Brave New World, The Caiman City Project
DC Heroes
AlertForce, DCH House Rules, More Action Fun, The Unofficial DC Heroes JLA Source Page, Writeups.org
Free Systems
Men & Supermen, Panels, Powergame Home Page, Risus Supers Version 1.1, Rumble, Super Heroes and Heroines, Super Human High School
Heroes Unlimited
Event Horizon 2028, Heroes Unlimited: Brute Force, Heroes Unlimited: S.N.A.I.L., Realm of Rikonian
Living Legends
Asymmetry: Role-Playing: Villains and Vigilantes, Gargoyles Characters, Living Legends, Morpheus Unbound's Villains and Vigilantes, The Signal, Worlds Apart: Villains & Vigilantes, Yahoo Groups : VandV
Mutants and Masterminds
Arcady's Mutants And Masterminds Game, Brand's Brand Publications, Defenders-5, Devils Workshop, E-CORE - M&M Superlink News, Freedom City - Mystery Men, Hall of Justice, Heroes and Henchmen, Mutants & Masterminds HQ, Mutants and Masterminds
Silver Age Sentinels
EvilHat.Com, Guardians Of Order, Silver Age Sentinels - Draxzaster.com, Yahoo Groups - Silver Age Sentinels
Department of World Justice
Non-system specific campaign set in the near future. Includes characters, organizations, and players.
Heroplay.com
Characters, articles, and a player registry for multiple gaming rules.
Stuperpowers
A comedic superhero roleplaying game from Evil Twin Comics. Contains ordering information, review blurbs, comic strips, character descriptions, and downloads.
The Central Nexus
Descriptions of and characters for multiple systems. Includes DragonCon convention pictures and commentary.