Dictionaries
http://dictionary.cambridge.org/
https://en.oxforddictionaries.com
Study pages for EFL students:
http://learnenglishteens.britishcouncil.org/
http://www.oup.com/elt/englishfile/
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
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://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
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