What Note taking app and other productivity apps do you use as a devloper?

I am a grad student who started working as an intern. So I am curious to know about any productivity apps you use to keep track of your progress and notes. I use Boostnote to take notes but I am finding it difficult to sync it across my work laptop and personal laptop. And I am not sure if OneNote is good because afaik it doesn't support markdown syntax which is important to me because I save a lot of code snippets. And are there any other tools like trello board you use regularly?