Title mostly says it all. Preview is unironically an incredible piece of software. Between feature set and ease of use, I have yet to come across any FOSS that is comparable. Anyone know of a Linux alternative?
EDIT: Due to popular demand I should explain Preview more. It’s a “fully fledged” PDF editor, but somehow it’s completely different from something like Adobe Acrobat. The way most users will interact with it is as a seemingly very plain image viewer, but if you open a PDF you can add fillable boxes, rearrange pages, split and merge PDFs, etc. I cannot place exactly why it’s workflows feel so much better than something like Acrobat.
Completed task successfully! For future readers, the process seems to have slightly changed. Now you go to Okular preferences, Annotations, Add annotation, call it Signature, etc. You can even resize the signature, which is really useful when the resolution of the PDF varies.