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Re:Cups Printing System Open-Source Development Has Seemingl... by toyg on Thursday October 15, 2020 @04:47AM (#24786303)
MacOS has a "signature" option in Preview for that kind of work.
Re:Cups Printing System Open-Source Development Has Seemingl... by minot on Thursday October 15, 2020 @05:19AM (#24786548)
To add to that, At least on fedora Linux and likely everywhere else Xournal can open PDF files and you can type free form text or even scribble from within the app.

I use a pen because my Lenovo Flex 14 came with one but I imagine you could use a mouse pointer as well.