Prodigy - Radically efficient machine teaching

Genius - Genius is the world’s biggest collection of song lyrics and musical knowledge.

Brilliant.org - Brilliant - Understand concepts and build your problem solving skills with thousands of free problems and examples in math, science, and engineering.

Shazam - Shazam is a mobile app that recognizes music and TV around you.

Ransom - Ransom lets creators make extra money by crowdfunding the release of their work.

SoundHound - SoundHound - the most immersive music search, discovery and play experience on mobile.