Open source diagramming projects
Every project in the registry tagged diagramming, ranked by real GitHub adoption.
D2 is a modern diagram scripting language that turns text to diagrams.
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
Web based diagramming app that lets you build interactive diagrams and prototypes
Frequently asked questions
How many open source diagramming projects are there?
This registry tracks 5 projects tagged diagramming, with 33,303 GitHub stars between them. The most-adopted is d2 at 25,785 stars.
Are these diagramming projects free to use?
Yes — 5 of the 5 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?
5 of the 5 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.