Clozemaster - Learn a language through mass exposure to useful vocabulary in context.
SmartCards+ - Spaced Repetition Software for iOS. Modern, powerful and easy to use.
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.
FlipToMind - Space repetition app to help you remember everything
Bialect - Learn languages faster with stories.
Zorbi - Spaced-Repetition Flashcards - Other tools are built by boomers, Zorbi is built by students.