Language learning 

BBC Learning English - http://www.bbc.co.uk/

Dave’s ESL Cafe - http://www.eslcafe.com/

English Online France - http://eolf.univ-fcomte.fr/

Using English.com - http://www.usingenglish.com/   

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Dictionaries  

Cambridge Dictionary Online - http://dictionary.cambridge.org/

Word reference - http://www.wordreference.com/fr/

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Grammar  

English – hilfen.de - http://www.englisch-hilfen.de/

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Vocabulary 

Business English Vocabulary Exercises - http://www.better-english.com/

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Writing recources

The Owl at Perdue (Perdue University) -  http://owl.english.purdue.edu/