Draw.io My go-to option for diagrams Draw.io, often known as diagrams.net, is one of the best open-source diagramming tools that rivals and often surpasses commercial offerings like Microsoft Visio.

mxgraph is another open source, pure JavaScript, client-side library for creating interactive diagrams that renders to SVG and HTML and it’s free! The authors explain: ...

Produced by Jgraph Ltd, draw.io (also known as Diagrams.net) was first released under an Apache license in 2017. It has a repository on GitHub, although only the core is open source, and external ...