CyberCon
A totally on-line convention for role-playing gamers. Topics include games and GM's, seminars, guest speakers, contests, art show, auction, exhibitors, and prizes.
http://cybercon.rpghost.com/
Dynamic Simulations
Roleplaying community hosting sims of all genres. Primarily focused on play-by-mail and play-by-post platforms.
http://www.dynamicsims.com/
Gemynd Online
Multiple simulation themes, including sports and fantasy medieval campaigns. Each game has unique page and information.
http://gemynd.com/