MIRC

The most widely used IRC client

http://mirc.com/

And NO! MIRC IS NOT IRC ! You cant be "on Mirc",you can just use it. or not.

The offcial statement:

mIRC is a shareware IRC client for Windows. It is developed and copyrighted by Khaled Mardam-Bey. mIRC is a highly configurable IRC client with all the goodies other clients on UNIX, Macintosh and even on windows offer, combined with a *nice* and clean user interface. mIRC offers full color text lines, DCC File Send and Get capabilities, programmable aliases, a remote commands and events handler, place sensitive popup menu's, a great Switchbar, World Wide Web and sound support, and... a lot more. mIRC is shareware but not crippled in any way...

http://mirc.com/faq.html

(insert how to hack ctcp version reply here)

hardcoded version reply..you need to hex it..

http://www.flurnet.org/archive/papers/mIRC_VersionSpoofing.pdf

follow up paper for the latest version of mIRC: http://www.flurnet.org/archive/papers/mIRC_VersionSpoofingII.pdf

Mirc does not work with ssl irc servers as standard but there is a nice plugin MircSSL

NB: New versions of mIRC do support SSL now, or so it seems.