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Agreed! Just came hear to say the exact same thing. Excalidraw (https://excalidraw.com/) is great and I've been really enjoying using it for the past few months, it's great for just throwing together a handful of rough diagrams over zoom to help illustrate code review meetings

That is a nice tool. Thanks for spelling it out.

I decided to start paying for Excalidraw after barely using it - it's so good.

Along with that, also:

https://draw.io