Configurable and extendable Icq client written in Tcl/Tk. Supports ICQv8 (OSCAR) protocol.
Lightweight, modern, flexible and well-customisable cross-platform multi-protocol instant messaging client
A fork of pidgin which aims to provide minor features that have not been addressed by the pidgin development team (including manual textbox resizing). See funpidgin.sf.net for details.
Simple messaging client and server (currently in TCL/TK and GTK+).