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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.
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.