working with PDFs in Drupal 8

If only working with PDFs in Drupal 8 was as easy as handling images in media libraries... Now, who's with me for a "PDFs in Drupal core" initiative? No need to "despair", though: if you need to generate and handle PDF files on your Drupal 8 website, you still have a handful of tools (meaning useful PDF Drupal modules), Composer and PDF generating libraries at hand. Inspired by an older Drupalcon session on "PDFs in Drupal" and Mediacurrent's synthesizing blog post on this topic, I've decided to put together some sort of compilation of the best available tools.