Homecoming : All Dwarven PBeM - Using D20 rules, a small party of Khazad return to their ancestral home - ostensibly to search for an ancient weapon, but the band is truely interested in exploring and -- if possible -- reclaiming their ancestral home. - http://www.homecoming.8m.com/index.html
The Forest Oracle - 2nd Edition AD&D game set in the Forgotten Realms. - http://games.groups.yahoo.com/group/forestoracle/
Kyrcant's Realm - Play by email, pbem dnd d20 - an online rpg and resource site for tabletops gamers. - http://www.kyrcant.net
Nerana PBEM - Dungeons and Dragons 3rd Edition Play By Email on the homebrew world of Nerana - http://www.geoste.com/neranian/
Saif's "Night Below" Campaign - Halted adventure based on the Nights Below modules. Features rule information, guided tour, and game history. - http://www.bluearch.net/night/
Thunder Canyon - The campaign "follows the exploits of a brave and determined band of heroes as they explore a world ruled by magic and the sword". Features background, characters, and rules. Lurkers welcome. - http://pbem-portal.com/org/rpgrealms/ThunderCanyon/