What about a fully featured PDF tool (page deletion, blank page instertion, OCR, edition, conversion, cropping, reorientation, etc...). This is a very missing feature of the linux world, we always have to jump from one software to another. An alternative would be to build the plugins of Okular to allow to make these operations.

It looks great, but it is far from easy to install... Either you have to compile to use docker! Computer are not made for mathematicians only anymore ; )