The BBC website for learning English has lots of free resources, including courses at different levels, an online drama to follow, vocabulary, grammar and listening practice, words in the news and graded articles on all sorts of interesting topics. There are sections for kids, teens and adults. 

Here you can find free video and audio resources for learners of all ages and at all levels, including games, English skills through football, a mini soap opera, podcasts, articles and a discussion forum to ask questions, find advice about learning English and make friends from all over the world. 

Here you can find hundreds of fascinating short lectures by experts in everything from design to psychology. Although not strictly a website for learning English, it is very accessible to non-native speakers. Subtitles are available in English for every talk; unlike subtitles for movies and TV shows, which are abbreviated versions of the actual dialogue, TED subtitles are complete, meaning they’re great for listening practice. A transcript is also available.