Excalidraw
Excalidraw · Design & prototyping
Open-source virtual whiteboard for hand-drawn-style diagrams with live collaboration, embeddable as a React component, plus a hosted Excalidraw+ service
MITOpen sourceFreeLocalSelf-hostedNov 2, 2026
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Mermaid
Mermaid project (Knut Sveidqvist and contributors) · Design & prototyping
JavaScript library that renders flowcharts, sequence, class, state, ER, Gantt and other diagrams from a Markdown-like text syntax
MITOpen sourceFreeLocalNov 2, 2026
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