The home for TclChat is http://www.dedasys.com/freesoftware/applications.html which has both web and tk interfaces.
mxmanghi 5-11-2014 This page seems not to be available anymore on dedasys.com, either David discontinued his support for the program or moved it elsewhere
TclChat was designed with the idea of separating the model, view and controller components. This made it relatively easy to create both Tk and web interfaces.