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.
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.