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BBC Learning English

An awesome resource to improve your command of English in every way possible! The site contains a constantly updated section on Grammar and Vocabulary, words and everyday expressions for various occasions, news topics and much more...

http://www.bbc.co.uk/worldservice/learningenglish/index.shtml

EngVid

Learn English for free with video lessons by experienced native-speaker teachers. New classes are added every week, covering grammar, vocabulary, pronunciation, TOEFL, and more. Join over one million ESL students worldwide who are improving their English every day with EngVid.

http://www.engvid.com/

Polyglot—English in 16 lessons

К.У.Ч.А. - Как Учить Чёртов Английский

Гид по английским временам от программиста @alex_andrero: