Excalidraw

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

It’s easy to create nice looking drawings.

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.