Quick Reference Material
Devoted to discovering all the words and everything about them. Wordnik is based on the principle that people learn words best by seeing them in context and has collected more than 4 billion words of text. At Wordnik, you get real example sentences to show words in context, meaningful information about your words frequency and use patterns, related words - not just synonyms and antonyms, but words that behave in similar ways, images tagged by users at Flickr, statistics, and an audio pronunciation.
Bartlett's Familiar Quotations
A collection of passages, phrases and proverbs traced to their sources in ancient and modern literature. (Example: Choose Thomas ý Kempis) (Reply: " And when he is out of sight, quickly also is he out of mind.")
An online dictionary as well as a translator is available at this website.
Search the headwords or full text of Roget's Thesaurus. Internal cross references are represented as clickable hyper-text links. Example: type "Wealth"/ press Enter) (Reply: sufficiency, adequacy, enough, etc.)