..my brain ;)
I have a somewhat schedule in my head daily.. of what needs to get done and when.. the priority of it all.. and that alone keeps me motivated with my time management! I work from home, so it's a huge balancing act of.. work, cleaning, house duties, relaxing, workouts, more work.. :)
I also use some apps - to'do on my iPhone! iCal, Google Calendar too!
I alsoooo.. use old fashion pen and paper ;)