Favorite productivity tool for entrepreneurs?

I'm building Protolyst - to organise all the gems of info that you come across in various places. My cofounders and I built it specifically to support venture building and entrepreneurial learning. It's similar to Notion but allows you to organise each nugget of info individually so you save time relocating them in amongst an ever growing sea of information. What about you, what's your favourite tool?

Notion and Figma.

Calendar, Notion, Pen and Paper (for to-do list)