Here is a list of Bots from a site that I found affter hours of searching. Please note I have not tested any of these but plan on doing so! Please respond if you find anyproblems... So here they are:
LuxerBot Mac OS X
Prolix Mac OS X
Battlegram Mac OS X
Javabot (any Mac)
JXBot (any Mac)
Purpletooth (Mac OS 8,X) Works on my OS9 but says its only for 8 and X
Thunderchat (8,9,X?)
MacBattle Chat (7,8,9)
Kanebot 2005
It dose apear how ever from reading short notes that these are only chat bots let me know how they work.