A lot of interesting command line programs get overlooked, I find it a nice idea to place these things online, accessible through telnet.
Starwars Asciimation : Port 23
The though work was done by simon jansen, he made it into a java applet. This is the same thing, but now via telnet.
Marvin, the paranoid Android : Shut Down
This an Eliza like bot, that tries to emulate marvin the paranoid android from the hitchhikers guide. The bot is Splotch, the eliza like bot, coded by Duane K. Fields and Mark Rages. The dictionary is a mixture of the one from elizatalk and the one from bitchbot, an irc bot, by pim van riezen.
The Bofh Excuse Server : Port 666
This service spits out an excuse based on the bastard operator from hell stories, I find it quite useful while dealing with my daily work. This brilliant list/script is created by Jeff Ballard
So Long and thanks for all the Fish