mxGraph is a fully client side JavaScript diagramming library. It is the underlying technology that powers the drawing functionality that you see in https://www.draw.io.
mxGraph is dual licensed. It is licensed under the non-commercial CC, http://creativecommons.org/licenses/by-nc-sa/3.0/, and the mxGraph license, http://www.jgraph.com/mxlicense.html. The mxGraph license is for commercial use, you can find the pricing at http://www.jgraph.com/purchase.html.
Getting Started
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If you prefer to download a zip of the mxGraph package, you can obtain that from http://www.jgraph.com/download.html.
In the root folder there is an index.html file that contains links to all resources. You can view the documentation online on the Github pages branch, http://jgraph.github.com/mxgraph. The key resources are the JavaScript user manual, the JavaScript examples and the JavaScript API specificiation.
Support
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If you have a programming question relating to mxGraph, you can either use Stackoverflow, http://stackoverflow.com/questions/ask/?tags=mxgraph, or our own technical forum http://forum.jgraph.com. Be aware Stackoverflow is a general Q&A site, ensure you use the mxgraph tag, that you have read the posting FAQ and that you have a programming question.
If your question is not programming related, or what you have to say is not a question, use our Google+ community instead, https://plus.google.com/b/100634082864796769666/communities/103111053636844545203.
If your interest is commercial and you prefer to talk privately, contact us via the jgraph.com site, http://www.jgraph.com/contact.html.
If you have bug reports or feature requests, use the Github issue tracker, https://github.com/jgraph/mxgraph/issues.
