With over 3 million estimated users, Pidgin is an open source instant messaging program for Windows, Linux, BSD, and other Unix platforms. It works with AIM, ICQ, Jabber/XMPP, MSN Messenger, Yahoo, Bonjour, Gadu-Gadu, IRC, Novell GroupWise Messenger, QQ, Lotus Sametime, SILC, SIMPLE, MySpaceIM, and Zephyr.
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