Pidgin is a free and open-source chat client which supports AIM, Google Talk, ICQ, XMPP protocols.

Bing helps you turn information into action, making it faster and easier to go from searching to doing.

Instantbird is a cross-platform instant messaging client based on Mozillas XULRunner and the open source library libpurple used in Pidgin.

Miranda IM is an open source multiprotocol instant messaging application, designed for Microsoft Windows.

Miranda NG is a successor of Miranda IM, a popular multi-protocol instant messaging client for Windows.

Tkabber is a GPL instant messaging client for the XMPP protocol which uses the Tk toolkit for the GUI.