assertpy
grappa
Nativeway
Duolingo
Rosetta Stone
Drops
Babbel
LinGo Play
Memrise
BeneTalk
Nativewaygrappa - grappa is an declarative, verbose, and expressive assertion library for Python.
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.