- Wikipedia
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Wikipedia is a free, open content, community-built encyclopedia with thousands of articles on topics from A to Z. Available in dozens of languages.
www.wikipedia.org
- Wikipedia in English
English-language version of Wikipedia, the online encyclopedia built and edited by users. Find encyclopedia entries on almost any topic, or click for a random Wikipedia article.
en.wikipedia.org
- Encyclopedia Britannica
Official site of the Encyclopedia Britannica, one of the world's best-known reference books. Find short encyclopedia entries and definitions, or register for complete access.
www.britannica.com
- Infoplease
Online encyclopedia entries, dictionary definitions, and thesaurus help from Infoplease, covering topics from astrophysics to Zimbabwe.
www.infoplease.com
- Answers.com
Get answers from a variety of encyclopedias, dictionaries, glossaries, and atlases with Answers.com, an online reference source.
www.answers.com
- Knol
A platform for user-generated knowledge. Knol encourages authors to write authoritative articles on specific subjects.
knol.google.com
- Freebase
An open, shared database of the world's knowledge.
www.freebase.com
- Everything2
User-created encyclopedia, web directory, and knowledge web. Everything2 offers definitions, articles, and writeups by readers about anything and everything.
www.everything2.com
- 1911 Encyclopedia Britannica
Searchable online version of the 1911 Encyclopedia Britannica, containing 29 volumes and articles written by more than 1500 authors on topics from A to Z.
www.1911encyclopedia.org
- Citizendium
Project to create a user-created encyclopedia that aims to improve on the Wikipedia model by adding 'gentle expert oversight' and requiring contributors to use their real names.
www.citizendium.org
- EncycloZine
Online store and encyclopedia. FInd information and products on topics like art, technology, history, science, sports, and space.
EncycloZine.com
- Probert Encyclopaedia
Online encyclopedia specializing in short, inter-linked articles about anything from famous actors to "psychological phobias.
www.probertencyclopaedia.com
- Rudiments of Wisdom Encyclopaedia
Cartoon, with A to Z drawings by Tim Hunkin illustrating topics like animals, geography, science, and history.
www.rudimentsofwisdom.com
- Yahoo! Reference
Find an online encyclopedia, quotations, and other fact-finding tools at Yahoo! Reference. Search for dictionary definitions, spelling help, thesaurus synonyms, maps, flags, and other answers.
education.yahoo.com/reference
- Article Insider
Community where real-life specialists share their knowledge about a wide variety of popular topics.
www.articleinsider.com
- Project Galactic Guide
Spoof encyclopedia meant to guide and misguide its readers in matters of life, death, and finding a parking space anywhere in the Universe, in the style of the Hitchhiker's Guide to the Galaxy.
www.galactic-guide.com
- BambooWeb Dictionary
Online dictionary and encyclopedia providing articles and information on a wide variety of topics. Browse encyclopedia entries by subject, or search for information by key words.
www.bambooweb.com
- 1902 Encyclopedia
Articles and illustrations from the Encyclopaedia Britannica, 9th Edition (1875) and 10th Edition (1902). Searchable by keyword and browsable by subject index.
www.1902encyclopedia.com
- Answers Encyclopedia
Get reliable, verified answers to your questions from encyclopedias, dictionaries, and other published sources.
answers.encyclopedia.com
- Fixed Reference: Snapshots of Wikipedia
Offers periodic fixed snapshot copies of Wikipedia, the collective online encyclopedia, allowing safe reference and linking without talk pages.
fixedreference.org
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