Excalidraw
By Excalidraw S.R.O.
Individual engineers, designers, PMs, students, and small teams who want fast, low-friction diagramming with a sketch aesthetic and are comfortable starting without an account. Also fits developers who want to embed an open-source whiteboard via npm and organizations that need self-hosting or end-to-end encrypted collaboration.
The excalidraw.com editor and open-source MIT editor are free with no account required
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