Pidgin is a chat program which allow you  log in to accounts on multiple chat networks simultaneously. This means that you can be chatting with friends on MSN, talking to a friend on Google Talk, and sitting in a Yahoo chat room all at the same time. Pidgin supporting Windows , Linux and other versions of Unix. It is very simple for installing and configuring Pidgin.
Pidgin is compatible with the following chat networks like AIM, ICQ, Google Talk, Jabber/XMPP, MSN Messenger, Yahoo, Bonjour, Gadu-Gadu, IRC, Novell GroupWise Messenger, QQ, Lotus Sametime, SILC, SIMPLE, MXit, MySpaceIM, and Zephyr. It can support many more with plugins. You can add plugins for facebook , twitter etc.
Download Pidgin Here
