Telnet

ChatNFiles BBS
Has a telnet-based chat/e-mail server and a web/FTP-based downloads area. The telnet-able Dragon Chat server provides "action", nickname registration, dynamic chat room creation and internal e-mail. It can also support connecting to an IRC channel.
http://www.chatnfiles.com/

Crazylands Talker
Multi command aliases, user socials, a few games including draughts, full twinkles support, and full dynamic spodlist.
http://www.crazylands.org/

Enchantment Under the Sea
A telnet talker with many games, features, and users.
http://seashell.dune.net

Space bar
Telnet chat based on the hyperreal server.
http://www.spacebar.com/

Tw's Talker - A Telnet Chat Community
English speaking with an international mix of chatters. Includes information on connecting, regular chatters, and other relative pages.
http://talker.rekka.net/