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.
Rosetta Stone - Rosetta Stone is the world's most popular software for learning languages. It is offered at a cost of just $169 when purchased outright, but it is also possible to purchase language programs in a subscription format that offers ongoing support.
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.