Pidgin is an easy to use and free chat client used by millions. Connect to AIM, MSN, Yahoo, and more chat networks all at once. Supported chat networks: AIM Bonjour Gadu-Gadu Google Talk Groupwise ICQ IRC MSN MXit SILC SIMPLE Sametime XMPP Yahoo! Zephyr
HexChat is an IRC client based on XChat. Features: Easy to use and customizable interface Highly scriptable with Python and Perl Fully open source and actively developed Multi-network with auto-connect, join, and identify Spellcheck, Proxies, SASL, DCC support and more