Bartlett's Familiar Quotations is a collection of passages, phrases and proverbs traced back to their sources in ancient and modern literature.
Merriam-Webster Dictionary and Thesaurus allows the searching of word meaning, pronunciation, origin, synonyms, and more.
Time and Date is a collection of calculators, converters, and other tools relating to time, date, weather, and the seasons.
Wikipedia is a free encyclopedia that anyone can use and edit.