OK Google - Explore over 150 Google Now voice commands in one place
Subtly - Learn English with smart subtitles on movies and TV shows
Paletro - Enable command palette (⇧⌘P) in any application on macOS
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.
Bestee - The world's fastest and only offline virtual assistant.
BoldVoice - Accent coaching app for non-native English speakers