[jsli]

Well, no one mentioned Bullet Journal: http://bulletjournal.com/

They've already done a good job explaining the system, so I won't do it here.

I used it when I was still in graduate school writing a paper. I managed to track tons of tiny details in the writing process.

I think the most useful thing is the task migration. You must migrate unfinished tasks from today's log to next day's log, manually. During the migration, I sometimes cross out some random thoughts that I put as tasks.

This is the time that you _must_ spend everyday. It somehow can keep up your sensation of completeness. I know some apps can help you do this automatically, like todoist, but I don't think that really works for a long run (at least not for me). I find that if I didn't do the review (migration), I intended to get slow start the next day, and gradually the system would collapse. That's how I failed todoist :(

Just my 2 cents.