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Pidgin
Pidgin and Finch - The Pimpin' Penguin IM Clients That're Good For The Soul!
The free, open source, instant messaging program for Windows, Linux, BSD, and other Unixes; formerly known as 'Gaim'. Pidgin supports many features of the various networks.
Pidgin can work with:
AIM / Bonjour /Gadu-Gadu / Google Talk / Groupwise / ICQ / IRC / MSN / QQ / SILC / SIMPLE / Sametime / XMPP / Yahoo! / Zephyr
Pidgin can log in to multiple accounts on multiple IM networks simultaneously. This means that you can be chatting with friends on AIM, talking to a friend on Yahoo Messenger, and sitting in an IRC channel all at the same time.
Pidgin runs on a number of platforms, including Windows, Linux and other UNIX operating systems.
Looking for Pidgin for OS X? Try Adium!
What is Finch?
Finch is the text-based version of Pidgin. It supports the same IM networks, but you can run it in a console window.
You can use it on Linux, BSD, and other Unixes.
What is libpurple?
libpurple is the programming library that powers Pidgin and Finch.
It's responsible for connecting to all the IM networks, and for managing your accounts and preferences. It's written in C and makes heavy use of Glib.
Website: Pidgin IM | SourceForge: Pidgin Project Page