@inkscape ...
Still missing in the open source world is a replacement for Acrobat Pro.
Last year I did a survey and research on PDF viewers for Linux and MacOS, and the result is really sad, since most open source viewers seemed to have stopped development and bugfixing years ago. Mozilla’s pdf.js is one of the best (supports forms as well as presentation mode), but can’t print properly.
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@inkscape ...
But as a prepress professional, I need e.g. “box” editing (crop box, trim box, bleed box), reliable color conversion, downsampling and PDF/X checking.
There are commercial alternatives, even on Linux, like PDF Master Editor and PDF Studio Pro, but they’re lacking in these features.
I do most of my typesetting with #TeX (#ConTeXt) and love GNU LilyPond, I can code in a few languages and use shell scripts a lot. But for cover design or image-centered layouts I use Affinity.