Reference.com
The encyclopedia had articles from such sources as the 2004 Columbia Electronic Encyclopedia, the Crystal Reference Encyclopedia, and (later) the English Wikipedia. Its online dictionary indexed the American Heritage Dictionary, Easton's 1897 Bible Dictionary, the Jargon File, the Kernerman English Multilingual Dictionary, Acronym Finder, Stedman's Medical Dictionary, Merriam-Webster's Medical Dictionary, the On-line Medical Dictionary, and WordNet. Its thesaurus was based on multiple versions of Roget's Thesaurus. The site's web directory was an interface to the Open Directory Project, and its web search feature used Google Search. An interface to Google Translate was added in 2008.