All audience encyclopedias:- Wikipedia
- Educypedia, a free online encyclopedia, provides a gateway to sources of technical and scientific matter on the internet. Educypedia is a collection of selected hyperlinks to online resources all over the world.
- WikiAnswers
- Encyclopedia Mythica -- encyclopedia of mythology, folklore, and religion
All audience dictionaries: Reference portals:
- LibrarySpot -- An online version of the reference desk in a library, with tons of links to online references.
- Internet Public Library -- An online library of website links vetted by librarians.
For kids:
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