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List of Alternatives to Adobe Programs
(feddit.org)
This is a most excellent place for technology news and articles.
For PDF "your browser" should be the default recommendation. Firefox allows to add text and images now. Gimp can also be used to edit PDF.
Browser is nice. On Linux though, Okular is superb (except for its occasional problems with forms).
I'm really disappointed not to see Okular there. It's FOSS, and it's very cozy and useful.
Started using it recently and i agree!