Links to other Worlds
The Confederation of Planes and Planets, or CoPaP for short, is a unique organization within the Neverwinternights Community. They are a group of autonomous persistent worlds (PW's) united by a special technology, and a common set of guidelines.
Linked Worlds
Arkaz The Islands of the Lost.
Avlis The World of Avlis. (wiki)
Hala The Heroic Domain of Ysgard.
Tairis'nàdur High Adventure, in a Frontier setting. New PCs encouraged, as well as Travelers.
And links to more
BioWare NWN 1 Persistent Worlds & Multiplayer Forum
Your Server List - Live-updating list of persistent worlds for Neverwinter Nights 1 (and others).
NWNList Scry - Live-updating list of persistent worlds for Neverwinter Nights 1 (and others).