Citadel

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Open-source virtual whiteboard for sketching hand-drawn style diagrams, wireframes, and architecture charts — collaborative and end-to-end encrypted.

The open-source HTML presentation framework — create beautiful, interactive slide decks using HTML, Markdown, or a visual editor, with 70K+ GitHub stars.

tldraw

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Infinite canvas whiteboard with real-time collaboration. Embed in your app as a React component or use as a standalone drawing tool. No signup required.

Penpot

45K

Penpot is the open-source design and prototyping platform that bridges designers and developers with web-native standards, real-time collaboration, and no vendor lock-in.

Onlook

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Open-source desktop app for visually editing React applications with changes written back to code in real-time.

Graphite

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Open-source 2D vector and raster editor with a nondestructive, node-based workflow that runs in the browser.