English Dictionary (Merriam Webster)   has thesaurus, medical, Spanish-English dictionaries and audio pronunciation; double-click on any word to find its meaning
English Dictionary (dictionary.com)   includes thesaurus, translator, encyclopedia, etc.
English Dictionary (Webster's)   double-click on any word to find its meaning, includes multilingual thesaurus translation
English Picture Dictionary   
English Picture Dictionary with sound   (languageguide.org)
Hmong-English Dictionary   
Somali-English Dictionary