I actually found cinnamin to be more resource intensive than Gnome on most computers.

When excalidraw was mentioned in another comment I think it would also be worth to mention tldraw even though I don’t kniw whether it can be counted as an replacement since I never used draw.io.

https://github.com/tldraw/tldraw

On Android, from FDroid you can install an app called Seal

I like ytdlnis more.

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