I am one of the creators of Robomind Academy that teaches programming to young (and not-so-young) people. We have been suggesting Sparki as a follow-up after our Academy for some time now, en even made and exporting function to Sparki.
Chromesparkle is free, not part of Robomind and comes without any guarantees.
If you would like to help use beta-test ChromeSparkle, have a look at deelenleer.nl.
Regards … Jan