Excalidraw
Open-source whiteboard that produces hand-drawn-style diagrams.
Excalidraw is a minimalist, browser-based drawing tool with a distinctive sketchy aesthetic. It is fully open-source, works offline as a PWA, and supports real-time collaboration via shared links. Diagrams export as SVG or PNG. No account required — open the URL and start drawing immediately.
Best for developers and technical teams who need quick, clean architecture diagrams and wireframes without installing anything.
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