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.
MailMate - MailMate is an alternative email client that was designed for the macOS.
Yozzi.com - Want to practice your writing skills in English? You can submit articles to Yozzi and receive feedback from native speakers. Yozzi welcomes guest interviews and guest posts, especially about language, culture, business and startups.
Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
Memrise - Learn a new language with games, humorous chatbots and over 30,000 native speaker videos.
Airmail - Airmail is a lightweight and lightning fast mail client for Mac.