A quick scan of sourceforge gives a bunch of projects whose name begins with tcl.  I'm going to trawl through them all.

   * http://tcldp.sourceforge.net/
   * http://tclines.sourceforge.net/
   * http://tcl-qt.sourceforge.net/
   * http://tcltk.sourceforge.net/
   * http://tcladdressbook.sourceforge.net/
   * http://tcldrop.sourceforge.net/
   * http://tclinux.sourceforge.net/
   * http://tclral.sourceforge.net/
   * http://tcltkaqua.sourceforge.net/
   * http://tclads.sourceforge.net/
   * http://tcl-edit.sourceforge.net/
   * http://tclipdnsmgt.sourceforge.net/
   * http://tclrar.sourceforge.net/
   * http://tcltkce.sourceforge.net/
   * http://tclae.sourceforge.net/
   * http://tcleftools.sourceforge.net/
   * http://tclish.sourceforge.net/
   * http://tclreadline.sourceforge.net/
   * http://tcltkmanpl.sourceforge.net/
   * http://tclagent.sourceforge.net/