Instantbird is an instant messaging client based on Mozilla XULRunner and the open source library libpurple created by the software developers of Pidgin . Over 250 add-ons allow user customization of, and addition of, features.
Tkabber is a Free and Open Source client for the Jabber instant messaging system. Its writen in Tcl/Tk, and works on many platforms (tested on Linux, FreeBSD, NetBSD, Solaris, MacOS X and Windows 98/2000/XP).
Ayttm is an instant messaging (aka chat) client that provides all-in-one chat functionality for several major instant messaging services from one simple program. Ayttm "Contacts" allow you to refer to several accounts of the same person from a single contact name...
CenterIM is a text-mode IM client for Linux, *BSD, Solaris and other Unices that uses libpurple as a communication backend.
Fire is a multi-protocol instant messenger client for Mac OS X based on freely available libraries for each service. Currently Fire handles AOL Instant Messenger®, ICQ®, MSN® Messenger, Jabber, limited IRC, Yahoo!®, and Apple Bonjour communications.
naim is a console client for AOL Instant Messenger (AIM), AOL I Seek You (ICQ), Internet Relay Chat (IRC), and The lily CMC.
NINA is a project that aims to revive several popular yet discontinued messaging services: AIM (AOL Instant Messenger), Yahoo! Messenger, ICQ, Classic AOL.
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