Here is the Nethack server at alt.org, Telnet link,  Java client, Flash client.  Here is a list of most of the ways to die in the game (dates back to 3.1.3).  And here are a lot of Nethack spoilers.
posted by JHarris on Dec 20, 2011 - 38 comments

Star Wars on telnet. It only gets about halfway through, but still an amazing effort.
posted by Gaz on Mar 1, 2002 - 16 comments

a good reason to dump telnet for ssh: The main goal of the HUNT project is to develop tool for exploiting well known weaknesses in the TCP/IP protocol suite. I tried to implement some 'new' features which I didn't see in any free product. (connection synchronization after attack, ARP relayer, ...)
posted by greyscale on Dec 20, 1999 - 0 comments