HTML comes to mind, but mobi/epub seems to be popular for ebooks. Then there's also docx, which is a standard these days.
Problem with docx is that there's no real way to _just_ view a file. I don't really want to spin up an entire word processor just to read the meeting minutes. I honestly much prefer a PDF to docx.
Someone could make a docx viewer easily enough if there was demand for it. it's just an xml file inside a zip file with the contents. it's no LaTeX but it's serviceable.
So that would explain why people are interested in tools that help manipulate pdf files?