IRC

irc.hackerslegion.com 6667 (ssl 6697)
(If you can use ssl, why wouldn't you?)

We also have web based clients, the Java client is more stable but the CGI:IRC client should work just about anywhere:

CGI:IRC (currently broken!)
https://irc.hackerslegion.com/cgi-irc/ (encrypted, preferred)
http://irc.hackerslegion.com/cgi-irc/

Java IRC
http://irc.hackerslegion.com/java-irc/

SSL certificate errors on https? Grab the CAcert Root Certificate.