'''"CHICKEN"''' is the name of a [Scheme] compiler and interpreter with a BSD-style license.

** Tcl/Tk bindings **

   * [http://wiki.call-cc.org/eggref/4/tk%|%tk] (Bremen licence)
   * [http://wiki.call-cc.org/eggref/4/pstk%|%PS/Tk] (Public domain, newer)

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