Office suite functionality without an office suite?

Hi all! I'm working towards a setup that is lightweight as possible. I've used Open and Libre offices before, I'm wondering can I do away with the suite entirely? I could use md + pandoc to produce text documents which takes care of my main use case for office. The only other thing I use office for is the occasional spreadsheet manipulation (auto-filling and basic math functions, tinkering with sums etc). I'm not sure of a suitable stand-in for this. Thoughts? No idea too crazy, bonus points if it works in a console, minus points for cloud services ;) Best Dede Lamb