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.

Blurtit - Blurtit is a Q&A website. You can ask a question or answer on any question.

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.

wikiHow - wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual.

Lingvo TV - Learn languages while watching movies on Netflix.

AllAnswered - Your Team's Collective Brain All-In-One Knowledge Management System Wiki + Q&A + Workflow + AI