I'm looking for a full PDF editor for use on Linux. Foxit, Qoppa... can't find anything on TPB, AllPCWorld or 4mirrorlink. Even looked on Milkie and saw a link for Qoppa PDF, but no one is seeding it.
Xournal++ also works well if you want to annotate PDFs. You can't edit text that's already there, but you can hide text with white rectangles and then write on top of them.
The free version of MasterPDF (as available via AUR) is fully functional, but it will add watermark if you modify any PDF page contents (and maybe other conditions).
MasterPDF Editor is quite good. In the past I found the windows keygen works with linux version. You have to block it from accessing internet though, or it will phone home to verify. This was a while ago I used it, so my info may be slightly out of date. Here's one way to block it from having internet access, start with this command: bwrap --bind / / --unshare-net masterpdfeditor5