InspIRCd is an Ok-ish IRCd to set up, however much more complex than the alternatives and had its share of problems in the past (security-wise as well as programming-wise(memleaks etc.))
Event though UnrealIRCd doesn't have the best reputation, it is still a quite easy-to-set-up IRCd and is still in more-or-less active development...
Depending if you'll only use this internally or not you might want to set up Services to provide some facility to register nicknames and make sure of the identity of participants in the chat - take a look at either Anope or Atheme for that.
Another IRCd to keep an eye on is ngIRCd [1], which claims to be small and lightweight - however i haven't had a chance to try it out yet...
Event though UnrealIRCd doesn't have the best reputation, it is still a quite easy-to-set-up IRCd and is still in more-or-less active development...
Depending if you'll only use this internally or not you might want to set up Services to provide some facility to register nicknames and make sure of the identity of participants in the chat - take a look at either Anope or Atheme for that.
Another IRCd to keep an eye on is ngIRCd [1], which claims to be small and lightweight - however i haven't had a chance to try it out yet...
[1] http://ngircd.barton.de/index.php.en