Note this is the release repo, only each release is pushed here. The development repo is https://github.com/jgraph/mxgraph2, submit PRs 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 diagrams.net, GraphEditor is the best example to use as a base.
The npm build is here
mxGraph supports IE 11, Chrome 43+, Firefox 45+, Safari 10 and later, Opera 30+, Native Android browser 5.1.x+, the default browser in the current and previous major iOS versions (e.g. 13.x and 12.x) and Edge 31+.
The mxGraph library uses no third-party software, it requires no plugins and can be integrated in virtually any framework (it's vanilla JS).
You may post on the issues tracker on this Github project, but we do not actively answer support questions. Issues most likely to interest us are clearly explained bugs in the core library and pull requests with a clear explaination of what they are fixing and how.
If you are looking for active support, your better route is one of the commercial diagramming tools, like yFiles or GoJS.
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 add features specific to our needs in diagrams.net.