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.

CodeFuel - CodeFuel content and search monetization allows content publishers to create new revenue streams and advertisers to hit targeted audiences.

Synonymful - Improve your vocabulary and communicate like a pro.

Coinis - Coinis is an ad-tech company providing unique monetization solutions to its affiliates and publishers while providing its advertisers highly engaging ad units powered by precise targeting.

Fluent - Fluent is a people-based marketing platform that uses real-time, one-to-one interaction to create custom audiences and serve personalized ads that drive performance at scale.

Sovrn - Sovrn offers insights, audience access and advertising solutions for publishers.