RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
Synthesia - A fun way to learn how to play the piano.
Slickdeals.net - Slickdeals: The Best Deals, Coupons & Discounts on everything
Playground Sessions - Online piano learning game.
Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.
Piano From Above - Piano From Above is a program that turns learning the piano into a videogame.