English
BBC Learning English
General and Business English, grammar, vocabulary, pronunciation
British Council: LearnEnglish
Listening exercises, grammar, vocabulary, etc.
British Council: LearnEnglish Teens
English activities for teenagers
EAP Foundation
Help with academic writing, speaking, etc.
English File
Exercises, games, etc. for all levels
engVid
American English video lessons
Headway Online
Exercises, puzzles and games for all levels.
Interesting Things for ESL Students
Word games, puzzles, quizzes, exercises, etc.
Learning Resources Bank
Extra exercises for Oxford course books.
Premier Skills English
Learn English with the football Premier League and the British Council.
Speakspeak
Exercises, grammar and vocabulary.
Study Zone
Grammar, reading and vocabulary from the University of Victoria.
UEfAP
Using English for Academic Purposes
British Council apps
LearnEnglish grammar, audio, etc.
Duolingo
App for learning various languages, including English
Hello English
Popular English-learning app
iGE: the interactive Grammar of English
Grammar course
Macmillan Apps for ELT
Pronunciation and IELTS
Oxford University Press ELT
Apps on Google Play