English Dictionaries & Thesauri
Visuwords is an online graphical dictionary where you can look up words to find their meanings and associations with other words and concepts.
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Snappy Words is an online interactive English dictionary and thesaurus that helps you find the meanings of words and draw connections to associated words. You can easily see the meaning of each by simply placing the mouse cursor over it.
Merriam-Webster is an online dictionary, thesaurus, medical dictionary and encyclopedia. In addition, you can view or subscribe to the Word of the Day, take word quizzes, view the most popular words , or browse by word topic.

Spanish Dictionaries & Thesauri
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Spanish Central is an online Spanish-to-English dictionary, but the site also has the Spanish Word of the Day, Spanish quizzes, and lists of most popular words.
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French Dictionaries & Thesauri

Chinese Dictionaries & Thesauri