Dictionaries

http://dictionary.cambridge.org/

https://en.oxforddictionaries.com

Study pages for EFL students:

http://learnenglishteens.britishcouncil.org/

http://www.manythings.org/

http://www.oup.com/elt/englishfile/

http://www.eslcafe.com/

Grammar

http://www.edufind.com/english/grammar/grammar_topics.php

http://www.englisch-hilfen.de/en/exercises_list/alle_grammar.htm

http://www.fortunecity.com/bally/durrus/153/gramtoc.html

http://www.myenglishteacher.net/

Vocabulary

http://www.learn-english-today.com/

http://www.idiomconnection.com/

http://www.languageguide.org/ingl%C3%A9s/vocabulario/animales-del-mar/

Writing

http://writefix.com/

http://www.cover-letters.com/

Reading

http://learnenglishteens.britishcouncil.org/skills/reading

http://www.breakingnewsenglish.com/

http://fictionchannel.tripod.com/ipx/mis.htm

http://fog.ccsf.cc.ca.us/~lfried/stories/stories.html

Listening

http://learnenglishteens.britishcouncil.org/skills/listening

http://www.esl-lab.com

http://esl.about.com/od/englishlistening/

http://www.englishlistening.com/

Speaking

http://learnenglishteens.britishcouncil.org/skills/speaking

http://eleaston.com/speaking.html#act

Games and Quizzes

https://www.voscreen.com/

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

Penfriend sites

http://www.ipfeurope.com/english/

Newspapers

https://www.theguardian.com/international

http://www.bbc.co.uk/learningenglish/

http://www.ingilizce.tk/?page=newspapers.htm

Other links

http://web.ttnet.com.tr/hussel/hselimler/Dosyalar/ingilizce_web_siteleri.htm