- 1902 Encyclopedia
 - Articles and illustrations from the Encyclopaedia Britannica, 9th Edition (1875) and 10th Edition (1902). Searchable by keyword and browsable by subject index. - 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.
- Alleypedia
![[new]](http://eur.i1.yimg.com/eur.yimg.com/i/uk/g/new2.gif) - Free, open, and collaborative encyclopedia about English language publishing industry that anyone can edit and improve. Features book publishers, literary and art agents, record labels, newspapers, magazines, tv, film, and theatre producers, and more. - Answers.com
- Get answers from a variety of encyclopedias, dictionaries, glossaries, and atlases with Answers.com, an online reference source.
- Article Insider
- Community where real-life specialists share their knowledge about a wide variety of popular topics.
- 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.
- 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.
- Encyclocenter
- Features a collection of original, informative, and authoritative articles on a wide variety of subjects.
- 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.
- Encyclopedia of Diderot & d'Alembert - Collaborative Translation Project
- English translation of the articles from the Encyclopédie edited by Denis Diderot and Jean le Rond d'Alembert in the 18th century.
- EncycloZine
- Online store and encyclopedia. FInd information and products on topics like art, technology, history, science, sport, and space.
- Everything2
- User-created encyclopedia, web directory, and knowledge web. Everything2 offers definitions, articles, and writeups by readers about anything and everything.
- Fixed Reference: Snapshots of Wikipedia
- Offers periodic fixed snapshot copies of Wikipedia, the collective online encyclopedia, allowing safe reference and linking without talk pages.
- Freebase
- An open, shared database of the world's knowledge.
- Infoplease
- Online encyclopedia entries, dictionary definitions, and thesaurus help from Infoplease, covering topics from astrophysics to Zimbabwe.
- Knol
- A platform for user-generated knowledge. Knol encourages authors to write authoritative articles on specific subjects.
- Probert Encyclopaedia
- Online encyclopedia specialising in short, inter-linked articles about anything from famous actors to "psychological phobias.
- 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.
- Rudiments of Wisdom Encyclopaedia
- Cartoon, with A to Z drawings by Tim Hunkin illustrating topics like animals, geography, science, and history.
- Wikipedia
![[*]](http://eur.i1.yimg.com/eur.yimg.com/i/uk/g/rating2.gif) - Wikipedia is a free, open content, community-built encyclopedia with thousands of articles on topics from A to Z. Available in dozens of languages. - 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.
- 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.
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