Information for English language study.
dictionaries:
http://www.thefreedictionary.com/
http://lookwayup.com/free/EnglishDutchDictionary.htm
Cambridge:
http://dictionary.cambridge.org/
http://www.english-online.org.uk/advexam/advhome.htm
http://www.cambridgeesol.org/teach/cae/index.cfm (exam CAE)
vocabulary:
http://thesaurus.reference.com
http://dictionary.reference.com
http://www.antimoon.com/how/pronunc-soundsipa.htm
webster: http://www.m-w.com/home.htm (dictionary with acoustic pronunciation)
Grammar:
http://www2.gsu.edu/~wwwesl/egw/index1.htm English grammar on the web.
Phrasal verbs: http://www.englishpage.com/prepositions/phrasaldictionary.html
English page: http://www.englishpage.com/
http://www.rhymezone.com/ For making poems, finding definitions, synonyms and so on.
http://www.bbc.co.uk/worldservice/learningenglish/
translator: http://dictionary.reference.com/translate/text.html
language challenges: http://www.englishclub.com
English as second language: http://esl.about.com/mbody.htm
http://www.freedict.com/onldict/dut.html
http://www.grammarstation.com/index.htm