Aaron's Tunnels & Trolls Stuff: Features new adventures, and a random dungeon generator for Windows.
Austin Weedn's T and T Pages: House rules.
Gristlegrim: An online Dungeon.
Ken St. Andre's Official Tunnels and Trolls Site: The original game designer provides previously unpublished material and discusses future editions of the game.
The Castle of Otranto: T&T References and Links: The definitive reference to Tunnels and Trolls online. Mostly links, but well-organized. Half a dozen on-line solo games.
Trollgod's Trollhalla: A web-based fanclub for Tunnels and Trolls players created by game designer Ken St. Andre.
Tunnels & Trolls: Flying Buffalo's official site for the game. Features product information and game history.
Tunnels & Trolls HQ: Features new kindred, character classes, and colleges of magic.