| Site |
Language |
Description |
Access |
| Archimedes-lab.org |
English |
Edutainment |
Free |
| Baidu Baike |
Chinese |
Collaborative online encyclopedia hosted by the major Chinese search engine Baidu |
Free |
| Banglapedia |
Bangla, English |
General interest |
Free |
| The Canadian Encyclopedia |
English, French |
General interest (original content of the hard copy Canadian Encyclopedia) |
Free |
| Citizendium |
English |
General interest, wiki |
Free |
| Columbia Encyclopedia |
English |
General interest |
Free |
| Compton's Encyclopedia |
English |
General interest |
Free |
| Conservapedia |
English |
Semi-open wiki written from politically extreme far right-wing and Biblical literalist perspectives |
Free |
| Credo Reference |
English |
General interest and subject-specific encyclopedias |
Subscription |
| Crnogorska Enciklopedija |
Montenegrin |
General interest (hopes to encourage a Montenegrin language Wikipedia) |
Defunct |
| Den Store Danske Encyklopædi |
Danish |
General interest |
Free |
| Deu Sözlük |
Turkish |
General interest |
Free |
| Digital Universe |
English |
Collection of articles on educational, cultural, and scientific topics |
Free |
| Diplopedia |
English |
US State Department internal encyclopedic wiki, available for diplomats and overseas US agents to use |
Access only through the State Department |
| Doosan Encyclopedia |
Korean |
General interest |
Free |
| EcuRed |
Spanish |
General interest. Cuban |
Free |
| Ekşi Sözlük |
Turkish |
General interest |
Free |
| Encarta |
English |
General interest |
Defunct |
| Encyclopædia Britannica |
English |
General interest |
Limited free access and features, subscription for full access |
| Encyclopædia Britannica –1911 Edition |
English |
General interest |
Public domain: completely free access from several online sources |
| Encyclopedia of China |
Chinese |
General interest |
Subscription |
| Encyklopedia Internautica |
Polish |
General interest |
Free |
| Enciclopedia Libre |
Spanish |
Fork of the Spanish Wikipedia, using wiki software, released under the GFDL |
Free |
| Enciclopedia Treccani |
Italian |
General interest |
Free |
| Encyclopædia Universalis |
French |
General interest encyclopedia published by Encyclopædia Britannica |
Subscription |
| Everything2 |
English |
General interest, users can submit articles on the topic of essentially anything |
Free |
| FAQ |
English |
A collection of searchable FAQs |
Free |
| GNUPedia |
English |
General interest articles are released under a GNU license |
Free |
| Gran Enciclopèdia Catalana |
Catalan |
General interest |
Free |
| Grand Larousse encyclopédique |
French |
General interest |
Free |
| Great Soviet Encyclopedia |
Russian, English |
General interest, often from the former official Soviet viewpoint. |
Free |
| Grolier Multimedia Encyclopedia |
English |
Targeted at the younger researcher, it contains the text of the Academic American Encyclopedia |
Subscription |
| Holocaust Encyclopedia |
English, Arabic, Persian, French, Spanish |
Holocaust-related articles |
Free |
| Hudong |
Chinese |
General interest. China's largest wiki |
Free |
| Hutchinson Encyclopedia |
English |
General interest |
Free |
| Infoplease |
English |
General interest |
Free |
| Internetowa encyklopedia PWN |
Polish |
General interest |
Free |
| Interpedia |
English |
General interest, the first site to propose a free encyclopedia written by users |
Defunct |
| Enciklopedio Kalblanda |
Esperanto |
General interest. The first online Esperanto encyclopedia |
Defunct |
| Kdo byl kdo |
Czech |
Biographies on notable Czech and Slovak people |
Free |
| Keyinpedia |
Chinese |
General interest |
Free |
| Knol |
English |
General interest |
Free |
| Kussmaul Encyclopedia |
English |
General interest with emphasis on science and the arts. First commercial online encyclopedia (1981–93). |
Subscription |
| Marefa |
Arabic |
General interest |
Free |
| Metapedia |
Hungarian, German, English, Spanish, Swedish, Romanian, Estonian, French, Slovenian, Czech, Portuguese, Norwegian, Croatian, Danish, Greek, Dutch |
Far right-wing, white nationalist and neo nazi encyclopedia |
Free |
| Meyers Konversations-Lexikon 4. ed. 1888 - 1892 |
German |
General interest |
Free |
| Nationalencyklopedin |
Swedish |
General interest, the most comprehensive contemporary Swedish language encyclopedia |
Subscription |
| New World Encyclopedia |
English |
General interest |
Free |
| Nupedia |
English |
Combined with GNUpedia |
Free |
| Open Site |
English |
Categorized community-built encyclopedia, inspired by the Open Directory Project |
Free |
| Private Sözlük |
Turkish |
Collaborative hypertext Turkish dictionary and encyclopedia site that shares a similar concept with Everything2 or H2G2 |
Free |
| Probert Encyclopaedia |
English |
General interest |
Free |
| Proleksis Encyclopedia |
Croatian |
General and national encyclopedia |
Free with registration |
| Quid |
French |
General interest |
Free |
| Sarvavijnanakosam |
Malayalam |
General interest |
Free |
| Scholarpedia |
English |
Articles are written by scholars and peer-reviewed for accuracy |
Free |
| Store norske leksikon |
Norwegian (Bokmål) |
General interest |
Free |
| Superpedia |
Bahasa Indonesia |
Indonesian, based on MediaWiki |
Free |
| Susning.nu |
Swedish |
A Swedish language wiki 2001–2009 |
Defunct |
| Từ điển Bách khoa toàn thư Việt Nam |
Vietnamese |
General interest. State-sponsored encyclopedia. |
Free |
| Veropedia |
English, Dutch, Spanish |
Mirrors stable versions of selected English Wikipedia articles |
Defunct |
| Vikidia |
French, Spanish |
Articles designed for children ages 8–13 |
Free |
| WIEM Encyklopedia |
Polish |
General interest |
Free |
| Wikipedia |
See list here |
General interest wiki |
Free, copyleft |
| Winkler Prins encyclopedie |
Dutch |
General interest, three different age levels |
Subscription |
| World Book Encyclopedia |
English |
General interest |
Subscription |
| Wikinfo |
English |
Holds multiple articles on subjects from different points of view |
Free |
| Site |
Language |
Description |
Access |
| Don Markstein's Toonopedia |
English |
Focuses on articles pertaining to print and animated cartoons |
Free |
| H2G2 |
English |
Collection of sometimes humorous encyclopedia articles, based on Douglas Adams's The Hitchhiker's Guide to the Galaxy. |
Free |
| Heroes Wiki |
English, Dutch, French, German, Hebrew, Italian, Portuguese, Spanish, Swedish, Turkish |
Contains articles pertaining to the American television drama Heroes. |
Free |
| Lostpedia |
English, German, Spanish, French, Italian, Japanese, Dutch, Polish, Portuguese, Russian, Chinese |
Contains articles pertaining to the hit drama Lost |
Free |
| Memory Alpha |
English, Bulgarian, Chinese, Czech, Dutch, Esperanto, French, German, Polish, Portuguese, Russian, Serbian, Spanish and Swedish |
Articles about Star Trek |
Free |
| The Rocklopedia Fakebandica |
English |
Articles on fake bands from popular entertainment |
Free |
| TV Tropes |
English, German, Esperanto, Spanish, French, Norwegian, Finnish, Swedish, Al Bhed, Quenya |
Articles related to the devices and conventions that a fiction writer can reasonably rely on as being present in the audience members' minds and expectations |
Free |
| Wookieepedia |
English, German, Spanish, Bulgarian, Danish, Finnish, French, Croatian, Hungarian, Italian, Japanese, Dutch, Norwegian, Polish, Portuguese, Russian, Romanian, Slovak, Slovene, Swedish, Chinese |
Star Wars-related articles |
Free |
| WoWWiki |
English, German, Spanish, French, Czech, Danish, Greek, Persian, Finnish, Hebrew, Hungarian, Icelandic, Italian, Lithuanian, Latvian, Dutch, Nynorsk, Bokmål, Polish, Portuguese, Brazilian Portuguese, Russian, Slovak, Korean, Japanese, Chinese |
World of Warcraft-related articles |
Free |
| Wowpedia |
English, Spanish, French, Czech, Russian |
World of Warcraft and Warcraft Universe -related articles |
Free |
| Site |
Language |
Description |
Access |
| Cut-the-knot |
English |
Mathematics related topics |
Free |
| Encyclopaedia of Mathematics |
English |
Encompasses articles on the topic of mathematics |
Free |
| EqWorld |
English, Russian, German, French, Italian, Spanish |
Articles on mathematical equations |
Free |
| MathWorld |
English |
Articles on a wide variety of math related topics |
Free |
| On-Line Encyclopedia of Integer Sequences |
English |
Encyclopedia of number sequences (what is next term after 1,2,4,9,20,48,115, ..., say?) |
Free |
| PlanetMath |
English |
Math related topics and articles |
Free/GNU |
| The QED Project |
English |
A project to establish a "distributed, computerized repository that rigorously represents all important, established mathematical knowledge." |
Free |
| Site |
Language |
Description |
Access |
| Animal Diversity Web |
English |
Student wiki-type database at the University of Michigan of animal natural history, distribution, classification, and conservation biology. |
Free |
| ARKive |
English |
Visual and audio recordings of the world's species |
Free |
| Encyclopedia of Life |
English, French |
Seeks to categorize all 1.8 million known species on the planet |
Free |
| Encyclopedia of Life Sciences |
English |
Biology related articles |
Subscription |
| Encyclopedia of Life Support Systems |
English |
Articles about the natural and social sciences |
Subscription |
| Erowid |
English |
Information about psychoactive substances |
Free |
| FishBase |
English, Spanish, Portuguese, French, German, Italian, Dutch, Chinese (Simplified Han), Chinese (Traditional Han), Bahasa Malay, Indonesian, Greek, Swedish, Russian, Persian, Vietnamese, Thai, Lao, Hindi, Bangla |
Articles on fish species |
Free |
| Flora Europaea |
English |
Covers different plant species |
Free |
| Macroscopic Observatory |
English |
Covers Flora and Fauna |
Free |
| Palaeos |
English |
Covers palaeontology |
Free |
| The Plant List |
English |
Covers Flora |
Free |
| Wikispecies |
English |
Seeks to create a catalogue of all living things |
Free |