I'd say 95% Markdown + Pandoc for when I make documents. The other 5% is LibreOffice.
When it comes time to make graphs and charts I really like wasting my time so I always try out something new (or old) to get the job done. Last time I used Pygal.
When it comes to dealing with docs from colleagues, it is all LibreOffice and Zathura.
OnlyOffice. FOSS, great MS compatibility, more modern than LibreOffice, local apps and runs in web with Nextcloud with great document collaboration options.
Usually OnlyOffice though I keep LibreOffice installed as a backup as sometimes I've had weird compatibility issues with the former (very few and far between but still)
Markdown for myself, Google Docs when I'm collaborating with others, and OnlyOffice after puking a little in my mouth for having received a docx or pptx by email.
LibreOffice, as I've been using it from soon after it was forked from OpenOffice and I'm used to it, and I don't think it's worth it to learn how to use another office suite when the one I use works fine for everything I need to do. I had tried OnlyOffice on another computer and I was positively impressed, but not quite enough to feel I should switch; in the end I only even use a small subset of the features LO has.
Most people don't know this, but OpenOffice is pretty much dead. It hasn't been getting any real updates for quite a while. LibreOffice is pretty active and is the one you'd want to go with.
I was using LibreOffice on everything but for some unknown reason it just flat out stopped working on my machine so I installed OnlyOffice and honestly I much prefer it.
What makes you prefer OnlyOffice over LibreOffice? I like how OnlyOffice seems to decrease possible format errors, so I tend to open docs in it after putting them together in Libre.