ConfusingWords.com: A collection of 3210 words that are troublesome to readers and writers. Words are grouped according to the way they are most often confused or misused.
Project Gutenberg: There are over 25,000 free books in the Project Gutenberg Online Book Catalog.
Merriam-Webster Dictionary and Thesaurus: Free online dictionary and Thesaurus
Knight Cite: KnightCite is an online citation generator service provided by the Hekman Library of Calvin College. This service simplifies the often tedious task of compiling an accurate bibliography in the appropriate style by formatting the given data on a source into a reliable citation, eliminating the need to memorize minute details of style for multiple kinds of sources.