Open Source JointJS Alternatives
The best open source alternative to JointJS is Diagram-JS. If that doesn't suit you, our users have ranked seven alternatives to JointJS and four of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to JointJS are mxGraph, JavaScript InfoVis Toolkit and Draw2D.
Diagram-JS is an open-source toolbox for displaying and modifying diagrams on the web.
mxGraph is an interactive JavaScript HTML 5 diagramming library. It can be used to build anything from simple workflow editors, up to fully functionality online diagramming applications, like diagrams.net.
Discontinued
Mxgraph was discontinued, but some forks are listed in the description of the GitHub repository.
JavaScript InfoVis Toolkit is a JavaScript library for visualizations and diagrams. The JavaScript InfoVis Toolkit provides tools for creating Interactive Data Visualizations for the Web.
Create Visio like drawings, diagrams or an workflow editor with the Draw2D Javascript library.The User interface allows interactive drawing by using your standard browser. No additional software; no third party plug ins. Just run it and use it.
Discontinued
No releases in almost a year:https://github.com/freegroup/draw2d/releases