ReadNotify - ReadNotify enables the user to know when email is sent and the reciever reads the email.

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.

Bananatag - Find out what happens to your emails after you press send! Add email tracking, attachment tracking, email scheduling and templates to your daily emails.

Synonymful - Improve your vocabulary and communicate like a pro.

Poppulo Email Communications - Poppulo provides a complete internal communication tool. Create & send better employee emails, measure results with IC specific analytics. Get a free trial.

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.