The Telnet BBS Guide focuses Bulletin Board Systems – the original Social Network, serving the BBS community for over 27 years! We list both Dial-Up and Telnet accessible Bulletin Board Systems all over the world. We currently list 976 BBS and related systems with brief and detailed descriptions and a downloadable text-version listing suitable for listing on your BBS or for as a download for others to view and use.
BBS and IRC. Technically neither are totally dead, but that was my introduction to the Internet a few years before the WWW existed.
There are a few people running telnet-connected BBSes on the Internet.
kagis
Ah, someone has a list.
https://www.telnetbbsguide.com/