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.
MyTweetAlerts.com - Like Google Alerts for Twitter
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.
Talkwalker Alerts - Better than Google Alerts
Reji - Improve your vocabulary hassle-free 📚
Charm - A little companion app for collecting Tweets