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Is there a code visualization website for Racket programs (for novice WeScheme users) similar to what is available at Online Python Tutor? Needless to say, it would provide a great self-teaching or learning tool.

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DrRacket provides a Stepper--it's one of the buttons in the toolbar--that shows the evaluation of programs written in Beginning and Intermediate student languages as a sequence of steps. Its interface is not as pretty as the page you point to--as the author of the Stepper, I can say this with confidence--but it's a visualization tool along the same lines as the one you describe.

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Thanks, John. How about for novice WeScheme users? What would you suggest for them?
RE WeScheme: my summer plans will be focused on improving WeScheme. I hope to integrate tracer (planet.racket-lang.org/package-source/tracer/tracer.plt/1/9/…) into WeScheme. It requires me to build some back-end infrastructure to support it. It's in the works.
Tracer is cool! Look forward to having it on WeScheme as well.

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