Habitica is a task manager app that was recently featured in the iOS app store. It is also available on Android.
What caught my attention about it was that it used gamification as a motivator to help you accomplish your task. Gamification is the act of adding game-like elements to make something that may be mundane to make it interesting. It is usually used for education.
This 8bit RPG style game/task manager allows you to first create a character for yourself with sever customizing options. A Zelda style guide walks you through each step as you set up your account.