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.

Brain Games - Boost memory power with free brain games

OptiLingo - OptiLingo: Dreaming of Speaking a New Language?

Dualnback.works - Dual N-back is a specific brain training exercise, that's been shown by research - it might improve fluid intelligence.

Mondly - Learn 33 languages in 500 bite-size lessons and 14 conversational modules.

Hue Brain Games - Play interactive games with your Philips Hue lights