STk is a free R4RS Scheme interpreter which can access the Tk graphical package. Concretely, it can be seen as the standard Tk package where Tcl has been replaced by a Scheme interpreter. STk embeds also an efficient CLOS like object oriented system, called STklos, which provides:

  • multiple inheritance
  • generic functions
  • multi-methods
  • a MOP (Meta Object Protocol)

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