Even though this question has probably been asked countless times in other communities, I still want to know: what tool do you think comes closest to ShareX? I’m particularly interested in features like image capture, video recording, GIF creation, and OCR reading all in one tool for Linux.
Your question would be much easier to answer if you explained what it is that this ShareX thing does that you want to do.
As it apparently doesn’t exist for Linux, or else you wouldn’t have asked, it seems safe to assume that most Linux users aren’t familiar with it.
Personally I use ksnip. Pretty sure it doesn’t do video though. It does do assorted image capture, OCR (if you have Tesseract installed), and supports uploading to imgur, FTP, and anything you can manage to do with a script.
There isn’t really a perfect replacement for ShareX that I know of.
I think Flameshot is very close to ShareX