Miranda IM is the smaller, faster, easier instant messenger with support for multiple protocols. Designed from the ground-up to be resource efficient while still providing a rich feature set, Miranda includes support for AIM, Jabber, ICQ, IRC, MSN, Yahoo, Gadu-Gadu and other protocols. Additionally, with the choice of hundreds of plugins, icons, sounds and other content, Miranda IM gives you the ability to modify, customize and extend functionality to make it your own.
Partially or fully Miranda supports the following protocols:
AIM (AOL Instant Messenger)
IAX (Inter-Asterisk Exchange)
IRC (Internet Relay Chat)