See also Snap! which is very actively developed and used pretty widely, and open source:
<a href="http:&#x2F;&#x2F;snap.berkeley.edu&#x2F;" rel="nofollow">http:&#x2F;&#x2F;snap.berkeley.edu&#x2F;</a><p>Or for iPads there is the Tickle app: <a href="https:&#x2F;&#x2F;tickleapp.com&#x2F;" rel="nofollow">https:&#x2F;&#x2F;tickleapp.com&#x2F;</a><p>and of course the code.org site which I believe uses Blockly: <a href="https:&#x2F;&#x2F;code.org&#x2F;" rel="nofollow">https:&#x2F;&#x2F;code.org&#x2F;</a>