Browser Based
Boomers Domain, Infinite Realms: Into the Unknown, Legend of the Green Dragon, Library of Lokil, Thardferr, The Darkness Gathering, Thorthgar-Online D&D Cybrtown
IRC
AD&D on IRC, AD&D: The Grovewood Saga, Aventhlew: The Hidden Land, Bardic Tails Tavern, Conquering Keld, Dark Destiny, Dragon Lance and Regular Chats, Syree, The Guiness Empire Campaign, The World of Orlantia
Message Boards
Adventures in Breminor, Death's Door, High Fantasy, Land of Emanon, The Isles of Aledeon, Whispers in the Dead of Night
Play-By-E-Mail
Black Sun Rising, Bohavia, Cloven Shield Adventurers Guild, Dungeons and Dragons, Heroes of Redmarch, Lily's So-Called Realms, Nerana PBEM, Realm in the Myst, RealmQuest, RealmsQuest: Sanctuary of Art and Literature
DnD Realms of Adventure
Greyhawk, Ravenloft, and Planescape campaigns played via America Online chatrooms.
G.O.R.E. Online
An online Advanced Dungeons & Dragons roleplaying group. They play weekly over AOL Instant Messenger chat. Has a message board and other gaming resources available.
Macrays Keep
This is another site dedicated to the furtherance of play by message board role playing games. Like Rondaks it is well planned and a popular place for people with these interests to get together.
The Blade of Enric
A D&D 3rd edition Ravenloft campaign, played using both a play-by-email type online forum system for plot movement and character development, and the Neverwinter Nights game engine for "live-action" online gaming sessions.
The Forgotten Realms Revolution
A site where AD&D players join, and play together for free. Includes portraits, characters, and multiplayer game events.
The Knight of Honor's Sanctuary
A tribute and sanctuary to the paladins of yore and the office of paladinhood as depicted through history, fantasy and story. An interesting site especially for prospective paladins, worth a visit!
The Living Web
An openRPG and WebRPG community which hosts online games using the Dungeons & Dragons rules and the Forgotten Realms setting, play or DM online.
The World of the Saas
Group of DM's and players who work together to create D&D adventures.
Ultrann's Gladiators
Ultrann the mysterious mage has taken a hiatus from his many adventures and has settled down to the life of a fighter's pit moderator. For the past few months he has worked for and with Torgal. A site for fighting characters using AD&D rules.
World of Arkaela
This is a site dedicated to the fusion of the characters from Julian May's 'Many Coloured Land' Books with the AD&D Spelljammer campaign setting. It's aim is to provide enough information for players and DMs alike to get started with Tanu as a player race.