Adium is a popular free instant messaging client for Mac OS X that supports multiple IM networks, including Windows Live Messenger, Yahoo! Messenger, Google Talk, AIM, ICQ and XMPP. It supports many protocols through the libraries libezv (for Bonjour), MGTwitterEngine (for Twitter), and libpurple (for all other protocols). It is written using Mac OS X's Cocoa API, and it is released under the GNU General Public License, and many other licenses for components that are distributed with Adium.