Tcl is an excellent tool for educational purposes:
* Do you want to Teach programming to children? then you may be interested on Robbie the Robot or Turtleshell * What about teaching some mathematical concepts? Try a triangle toy,Triangle Madness or, in Playing BLT you will find an interactive function plotter example. * You can also take a look of: Who Wants to be a Tcl Hacker and customize the questions and answers to any subject and have some fun with your students. *There are also pages for the little ones, like Dot to Dots or a balance toy. There are much more you can take advantage of right here, with The Cool Language.