I’m not looking for a full PDF editor. Only to do tasks like merging and splitting PDFs, removing pages, or creating a PDF from a bunch of images.
https://www.ilovepdf.com is very handy, but I don’t like the idea of uploading my documents to them, especially if they have sensitive data.
qpdf is the best CLI tool that I have used to edit the structure of a PDF. I recommend it if you don’t require a GUI, and do not need to edit the content.