1290 Like

Wikipedia

Wikipedia is a free, multilingual encyclopedia project supported by the non-profit Wikimedia Foundation. Wikipedia has 17 million articles (3.5 million in English), which have been written collaboratively by volunteers around the world.

Free Open Source Android iPhone Android Tablet Web Kindle Fire Blackberry MediaWiki

47 Like

Everipedia

Everipedia removed some of the more annoying aspects of Wikipedia and created a site that is much easier to use. Notability requirements are eliminated and citations / editing are WYSIWYG.

Free Mac OS X Windows Linux Android iPhone iPad

21 Like

Reference.com

reference.com offers a massive online dictionary, thesaurus, encyclopedia, quote finder, and translator (powered by google translate)- all for free. for the dictionary.com and thesaurus.com mobile app, go here. http://alternativein .

Free Web

18 Like

Encyclopædia Britannica

The Encyclopædia Britannica is a general English-language encyclopaedia published by Encyclopædia Britannica, Inc., a privately-held company.

Commercial Mac OS X Windows Web

11 Like

Referata

Referata offers hosting of semantic wikis, allowing you to add, structure and store data so it can be managed, shared, browsed and analyzed in as many ways as you choose. Free: unlimited Wiki pages and 100MB file storage.

Freemium Web Self-Hosted

10 Like

Dixio

Dixio is the solution for all those who care about their language Who want to learn more and enrich their vocabulary: when you receive a presentation or prepare a document, when you are reading in Internet or preparing your curriculum...

Freemium Windows Android iPhone iPad Web

7 Like

Ancient History Encyclopedia

Ancient History Encyclopedia is a nonprofit company that aims to provide superior ancient history resources and information for free.

Free Web

6 Like

WikiGalaxy

Explore wikipedia in 3d.

Free Web

5 Like

Encyclopedia of Earth

Expert-reviewed information about the Earth. For everyone.

Free Web

5 Like

purple

Dictionary from the Elementary project.

Free Open Source Linux

4 Like

the full wiki

We find similar sentences to those in Wikipedia, complete with their citations for you to paste into your essay. It's the easy way to branch off to find authoritative sources and relevant quotes to deepen your research.

Free Web

4 Like

Wikifur

User-editable encyclopedia for fans of anthropomorphic animals. Over 18,000 articles on furry community and culture in twenty-one languages.

Free Web

4 Like

Newslines

Newslines lets people create shared timelines on any person, product or news event. Writers create news snippets that are combined into interactive multimedia timelines.

Free Web

3 Like

ListPod.net

Free Web

3 Like

Oppia

Oppia is a free, open-source learning platform. Full of interactive activities called 'explorations', Oppia helps curious minds learn and teach.

Free Open Source Mac OS X Windows Linux Web Self-Hosted

3 Like

Stubia

Stubia is a mobile encyclopedia that limits each article to 160 characters: this limitation makes each topic easy to understand.

Free Web

3 Like

Alchetron

Alchetron.com is a free social encyclopedia for world where you can create, organize and learn easily using topics.

Free Mac OS X Windows Linux Android Android Tablet Chrome OS Web

3 Like

Scholarpedia

Scholarpedia is a peer-reviewed open-access encyclopedia written and maintained by scholarly experts from around the world.

Free Open Source Web

3 Like

Encyclopedia.com

Online dictionary and encyclopedia with pictures, facts, and videos. Get information and homework help with millions of articles in our free, online library.

Free Web Java Mobile