Open source diagramming projects
Every project in the registry tagged diagramming, ranked by real GitHub adoption.
A proven SVG-based JavaScript diagramming library powering exceptional UIs
100% Free, Open-source local-first AI diagramming for architecture diagrams and flowcharts with animated exports.
excalidraw with collaboration feature, self-hosting, and only one-click deploy
Frequently asked questions
How many open source diagramming projects are there?
This registry tracks 3 projects tagged diagramming, with 6,780 GitHub stars between them. The most-adopted is joint at 5,386 stars.
Are these diagramming projects free to use?
Yes — 3 of the 3 carry an explicit open-source licence across 2 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which diagramming project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these diagramming projects still maintained?
3 of the 3 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.