Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.
Caption This - Create a smart caption for your photo in a second!
Drops - Visual language learning.
Quik by GoPro - Easiest way to create awesome videos
Clozemaster - Learn a language through mass exposure to useful vocabulary in context.
Pretty Captions - Create beautiful captions for Instagram and other platforms