http://www.cam-info.net/enc.html
An encyclopedia composed of information available on the Internet. MacroReference contains references to large areas of knowledge, FAQs where available, and pointers to relevant areas of the MicroReference. MicroReference contains short bits of inform
http://www.howstuffworks.com/
Articles explain how hundreds of things work, from elements of the human body to space-age technology.
http://hallencyclopedia.com/
Free Online encyclopedia in many languages like spanish, deutsch, french, japanese. The English version has more than 450,000 articles frequently updated.
