Mightytext - Send & Receive SMS Text Messages from your computer. Sync'd with your Android #
Flowkey - The easiest way to learn piano with your iPhone or iPad
Zeplin - Collaboration app for UI designers & frontend developers
Yousician - Learn to play music at home, at your own pace
ActiveWords - Auto correct on steroids
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.