A gamified task list, basically. Completing your task earns you in-game gold that you can spend on things like armour to upgrade your avatar. And there's a quest function where the tasks you do count toward damage points to defeat the boss, which earns you gold and eggs to hatch pets.
It doesn't work for everyone, but I've found it effective.
Re: Habit trackers
It doesn't work for everyone, but I've found it effective.