» Encyclopaedia Britannica Online
Provides complete text of Encyclopaedia Britannica with search capabilities, related links, and multimedia enhancements. Full text for subscribers only; free trial available.
» Hutchinson Encyclopedia
"A subset of the content (concise set) is provided for free, the access to the rest of the Hutchinson Encyclopedia requires subscription."
» Nuttall Encyclopædia of General Knowledge
Approximately 14,000 entries on topics including art, geography, literature, philosophy, religion. Originally published in 1907.
» Online Encyclopedia
Offers articles from on the 11th edition Encyclopedia Britannica, and from the Crystal Reference Encyclopedia. All articles are searchable and alphabetized.
» Wikinfo
User edited encyclopedia based on Wiki software. Contains articles, information on editing, and a list of differences between this encyclopedia and Wikipedia.
» World Book Encyclopedia
Online version of the complete reference work along with dictionary, atlas, links, magazines, historical documents, audio, video, images, and 3D photographs. Requires free temporary registration with option to buy continued access for full articles.