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Finally, if you have scanned documents in a PDF, then you will want some kind of OCR software. Tesseract is great for converting scanned documents to plain text, but does not handle layout. It's available on apt-based systems in the tesseract-ocr package, with tesseract-ocr-ABC packages for language support, where ABC is the 3-letter language code. Try apt search tesseract-ocr to see the list of available packages.
If you want to convert a PDF to a word document or the OpenDocument format, then it's probably Pandoc that you're after - but bear in mind that PDFs are absolutely not designed for being converted that way - in that the result of any program that does this is going to be less than perfect.
Ah, sure! Thanks for clarifying. The other piece of software that can convert like that is Calibre. It has a ton of options, but it more suited to books etc than regular documents e.g. forms etc.