Wordreference, Assorted Monolingual and Bilingual Dictionaries. Great multilingual dictionary with forums supporting the dictionaries where users can help one another and discuss about meaning, translation, grammar, styles…
Picture Dictionary English-Spanish, the dictionary for little explorers, and also Spanish-English.Click on a letter above and you’ll see words that start with that letters. Click on a picture or underlined word and you’ll link to a web page related to it.
Cambridge Dictionary, the world-wide acclaimed dictionary.
Pronunciation Dictionary, the dictionary that tells you how words are pronounced.
Linguee, the web is a dictionary. Created by Internet users with real examples of words in context.