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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

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

shadcn/ui

shadcn · Web frameworks & UI

Collection of accessible React components built on Radix primitives and Tailwind CSS that are copied into a project's source rather than installed as a dependency

MITOpen sourceFreeLocalNov 2, 2026

Tailwind CSS

Tailwind Labs · Web frameworks & UI

Utility-first CSS framework from Tailwind Labs that styles markup with composable class names and generates only the CSS a project uses

MITOpen sourceFreeLocalNov 2, 2026

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