Subtly - Learn English with smart subtitles on movies and TV shows
Speechyard - Learn English online through movies!
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.
English For Tech - The first modern English textbook for people in tech.
Andy Chatbot - Learn and practice English with exercises, grammar and games
BoldVoice - Accent coaching app for non-native English speakers