Note this is the release repo, only each release is pushed here. The development repo is https://github.com/jgraph/mxgraph2, submit PRs and issues there.
The PHP model was deprecated after release 4.0.3 and the archive can be found here.
If you want to build something like draw.io, GraphEditor is the best example to use as a base.
The npm build is here
mxGraph supports IE 11, Chrome 43+, Firefox 45+, Safari 9.1.x, 10.1.x and 11.0.x, Opera 30+, Native Android browser 5.1.x+, the default browser in the current and previous major iOS versions (e.g. 11.x and 10.x) and Edge 31+.
mxGraph uses no third-party software, it requires no plugins and can be integrated in virtually any framework.
mxGraph is licensed under the Apache 2.0 license. We do not sell any other license, nor do we have an option for paid support.
We created mxGraph in 2005 as a commercial project and it ran through to 2016 that way. Our USP was the support for non-SVG browsers, when that advantage expired we moved onto commercial activity around draw.io. mxGraph is pretty much feature complete, production tested in many large enterprises and stable for many years. We actively fix bugs and make minor improvements since it comprises the base of our draw.io stack.