The software looks promising, but my worry is that it has only one real developer until now.
https://github.com/JakubMelka/PDF4QT/graphs/contributors
On PDF Software
The new pdf features in OnlyOffice look good, but are limited to basic annotation and form filling
The easiest way I've found to actually PDF text on linux is to open it with LibreOffice Draw, do the edits, then re-export as a PDF.
Sometimes formatting and text styles are changed by this method.
davidjharder it's amazing Draw would function like Illustrator of photoshop. I can't see it converting it to raw postscript like those two, but it obviously converts it to some fluid form. far out.
17 days later
One thing that annoys and "cripples" me in linux is that there is no scroll wheel- click autoscroll available in pdf readers. I wish someone made that.