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The creative software industry has declared war on Adobe
(www.theverge.com)
This is a most excellent place for technology news and articles.
Have you tried Firefox or one of its offshoots like Librefox? They are surprisingly good at viewing and editing PDFs. Just drag the PDF into an empty tab. But I’m sure there are other ways to open them.
I have. But it's not a replacement for what I use Acrobat, regrettably. I think it'll get there eventually, though.
Adding images, adding text (not editing existing text), resorting pages, extracting pages, adding and deleting pages, and signing (less important).