iOS: Sometimes, you need to give yourself a bit of a pick-me-up. Tomorrow is an app that lets you record a message for yourself that you can play in the future.
Once you record a message in Tomorrow, it's locked away until the next day. The next day those messages are deleted whether you play them or not. It's a simple concept, but a fun way to motivate your future self to get things done.
Tomorrow (Free) [iTunes App Store]