Dictionaries
MnemonicDictionary.com
[ http://www.mnemonicdictionary.com/ ]
Find a fun and easy way to build your vocabulary using mnemonics, pictures, visual, etymology, usage, and word games.
Oxford Dictionaries
[ http://oxforddictionaries.com/ ]
A free online world and US English dictionary with puzzles and games, tips and guidance about better writing, spelling, grammar and other resources for children and schools.
Photographic Dictionary
[ http://photographicdictionary.com/ ]
A visual dictionary featuring thousands of common nouns with images.