Excalidraw

Excalidraw is a Virtual whiteboard for sketching hand-drawn like diagrams.

It’s easy to create nice looking drawings.

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It’s available Online or we can self-host or even use it as one of the unofficial extension into VScode / VScodium

As drawing is stored as JSON, it’s also convenient to use it inside a git repo.

There are also some nice features like creating charts or using existing shared libraries.