For which of the suggestions?
If you meant SSH, I'd suggest OpenSSH. It is a very popular and secure choice for an ssh server and thus I would not be surprised if there were RPM's readily available for it for your distro. Quite possibly either in your distro's repository or on the CD/DVD media.
for the Jabber server I'd just go with the latest jabberd for your distro
www.jabber.org
on the IRC front the choices are numerous and I'd not have any opinion on what would best fit your needs.
for moo/muck/mush etc.. again lots of choices but I have found that pennmush is quite nice.
if you do set up an SSH server I'd suggest going with public key access as there is a lot of people on the net trying to brute force SSH servers. restricting your server to public key access only (although a little harder to initally set up) renders such attacks impotent. (basically the server will just tell them "I don't take passwords.. go away"). Also your friends would have to leak both their public key and the password to said key for a breach to occur. Of course if they leak either of the two the key should be changed as a safety precaution.
Have Fun
Freemor