VocabularyBilingual
Wordreference
Reverso
Linguee 
Monolingual
Collins 
Cambridge
oxforddictionaries.com
Merriam-WebsterEflnet.com
Pictolang
Urbandictionary.com 
Visual dictionary 
Macmillandictionary.com
Languageguide.org/english/ 
oxfordlearnersdictionaries.com 
Longman 
Collocations
Ozdic
grammar.pngGrammarEdufind 
Self-study grammar quizzes 
English-hilfen 
ListeningEnglish sounds
Phonetic exercises
Englishspeak
Learningenglish (BBC)
Podcastsinenglish.coml
ESLpod.comEsl-lab.com
Reuters.com (video with transcripsts)
Tunein.com (radio stations)
Engvid.com 
Speakingenglishpodcast.com 
Rdlessons.com 
Learningenglish.voanews.com 
British council 
Elllo.org 
Lessonstream.org 
TEDAudioEnglish 
Letshavefunwithenglish
 Cinema.clubfefl.gr 
SpeakingSkype
howjsay.com
Text-to-speech
Language-exchanges.org
Englishbaby.com 
Speaking24.com 
Voxswap.com 
BBC learning English
Pronouncehow.com 
Forvo 
Shiporsheep 
Allphonetics
Englishclub 
Italki  
ReadingThe Times
The NY Times 
The Guardian
itellyouastory.com
BBC News Magazine 
Breakingnews 
Bibliomania
Esl-bits.net 
English e-Reader 
Writingoxforddictionaries.com
www.wikihow.com
About.com (formal letters)
by Alejandro Ramírez