Simply Piano - Fast and fun way to learn piano
GIFjam for Messenger - Animated GIF memes for Facebook Messenger
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.
Crumbles - Crumbles are like reaction GIFs with a way bigger vocabulary
Yousician - Learn to play music at home, at your own pace
GIF Search on Twitter - Get ready to search and send GIFs in tweets and DM's