I really like Workflowy. It really works for me, for organizing and working on things, for how I like to do things (a little bit at a time, unfocussed). The Android app is really good too
Alas, it's closed source/proprietary. I'm totally open to rec's for free software alternatives :) https://workflowy.com/
Then again, I do use, and love, #Pinboard for hosting bookmarks, and that's not #FLOSS. π€ Maybe cause I'm confident that won't be shut down, or sold, or stuffed full of adverts.
I do pay for #Workflowy, so maybe I don't have to worry then... π€