The source code in this repo is licensed under the Apache v2.
A development guide is being started on the GitHub project wiki. There is a draw.io tag on Stack Overflow currently, please make sure any questions adhere to their guidelines for questions.
The full packaged .war of the client and servlets is built when the project is tagged and available on the releases page.
diagrams.net supports IE 11, Chrome 70+, Firefox 70+, Safari 11+, Opera 50+, Native Android browser 7x+, the default browser in the current and previous major iOS versions (e.g. 11.2.x and 10.3.x) and Edge 79+.
Open-source, not open-contribution
Similar to SQLite, diagrams.net is open source but closed to contributions.
The level of complexity of this project means that even simple changes can break a lot of other moving parts. The amount of testing required is far more than it first seems. If we were to receive a PR, we'd have to basically throw it away and write it how we want it to be implemented.
We are grateful for community involvement, bug reports, & feature requests. We do not wish to come off as anything but welcoming, however, we've made the decision to keep this project closed to contributions for the long term viability of the project.