City of Heroes:Official site with feature list, screen shots, movies, FAQ and forum.
City of Heroes Badge List: Guide to badges and contacts, broken down by level range.
City of Heroes Europe: Official site for the european version of the game.
City of Heroes Faces: A gallery for players to post real-life pictures of themselves, sorted by server.
City of Heroes Online: Unofficial fansite providing guides, mission walkthroughs, strategies, maps and leveling guides.
City of Heroes Secrets: Offers information about several game aspects in table form for quick access.
City of Heroes Trade Source: Sells influence and Hamidon enhancements for the Justice server.
City of Heroes Wiki: An open collaborative database of information about City of Heroes.
City of Heroes Writer's Guild: A collection of fan fiction by various people, open for submissions.
CoH Champion: Forums for players on the Champion server.
CoH Comics: Player created comic books, screenshots, trading cards, and covers.
CoH GameAmp: Offers news, links and information.
CoH GamerGod: Game information and guild management.
CoH Stratics: Offers information, multimedia, and IRC chat.
CoH Warcry: Provides game related and comic book news.
Coldfront's City of Heroes: News site with reference guides, including information about temporary powers.
Fenris' Lair - City of Heroes: General information and guides for City of Heroes.
Heroes Hideaway: Contains zone maps and forums.
IGE: Sells influence, items, and user accounts.
Nofuture City of Heroes: Player reference site. Lists missions, story arcs, enemy information and hidden numbers.
Paragon Signs: Site devoted to the signs from inside the game.
ParagonCity.com: Offers game information and forums.
Tweak COH: Lets you customize certain features of the game.