I'm working on a personal organization app - basically integrating a to do list, habit tracker, and notes app into one. I think it's cool because it's useful to me and a "scratch your own itch" app.
If you're curious it's at https://www.nominal.net
If you're curious it's at https://www.nominal.net
Here's mine: https://github.com/upvalue/meditations
It also supports habits and notes, but in mine the tasks and habits are combined. I'd like to go further like you have in combining the notes and task interfaces (right now it's basically two separate apps that happen to be in the same codebase + database).