ESL/EFL resources for both levels

www.cla.univ.fcomte.fr/english/index_s.htm

Learn English Central, the British Council magazine for English students, where you can find lots of different activities (grammar, texts, games, listenings, etc.).

http://www.britishcouncil.org/learnenglish-central-magazine-themes-links-landing-page.htm

An English Pronouncing Dictionary with Instant Sound

 www.howjsay.com

Complete website with several OUP dictionaries available online:
http://www.askoxford.com/?view=uk

Free online dictionaries from CUP

http://dictionary.cambridge.org/

Here you have Merriam-Webster Dictionary Online
http://www.merriam-webster.com/

Online English dictionary and bilingual dictionary (Spanish-English-Spanish) with phonetics, forum discussions, etc.

www.wordreference.com