One capability that I haven't found yet in pdf editors for Linux is the ability to sign documents. Foxit does a nice job with this on my macbook. Anyone know of an editor that works for that?
I've found pdftk (pdf toolkit) very nice for splicing together pieces of several different pre-existing pdfs. It's a command line tool. See .https://www.pdflabs.com/tools/pdftk-the-pdf-toolkit/