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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LibreTube

AFAIK Opera has some kind of patent for this, so other browsers cannit implement it so easily.

In fact as a user of one different forum I was able to witness search engines logging in as bots for better access. I know this sounds made-up, but the forum was made with/powered by Xenforo. Btw XDA forums and lot of other forums are also made with xenforo. It’s possible that xenforo has a built-in support for search indexing bots, but I don’t reaľly know if that’s the case.