British Council - Learn English Kids

LearnEnglish Kids is brought to you by the British Council, the world's English teaching experts. We have lots of free online games, songs, stories and activities for children.
​http://learnenglishkids.britishcouncil.org/

Duolingo

Many teachers and even entire governments around the world already view Duolingo as the perfect blended learning companion for their classrooms. Duolingo lessons give each student personalised feedback and practice, preparing them to get the most out of classroom instruction.
​https://schools.duolingo.com/