I use most of these that you listed. Except that I don’t use office apps at all, and do all my documents using LaTeX in neovim.

Also, I have small helper scrips for pdf manipulation for tasks that I do regularly, like making my handwritten notes ready for printing at my office since I don’t like the algo my office printer uses to convert them to B&W. I also use sejda-console for merging PDFs as it has nice options for manipulating TOC during the merge.

Another nice utility is ffpb which is basically a wrapper around ffmpeg that gives it a nice progress bar.