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This is alist of well-known online encyclopedias that are accessible or formerly accessible on theInternet.
The largestonline encyclopedias are general reference works, though there are also many specialized ones. Some online encyclopedias are editions of a print encyclopedia, such asEncyclopædia Britannica, whereas others originated online, such asWikipedia.
| Name | Language | Description | Status | Access | Content license | Fork of | Merged with |
|---|---|---|---|---|---|---|---|
| Wikipedia | Various (see listhere) | General interest,wiki | Active | Free | CC BY-SA 4.0, GFDL | None | None |
| Nupedia | English | Combined with GNUpedia | Defunct | None | GFDL 1.1 or later | None | None |
| Interpedia | English | General interest, the first site to propose a free encyclopedia written by users | Defunct | None | Unknown | Free | None |
| Everipedia | English[1] | General interest | Read-only (archived) | Free[2] | CC BY 4.0 | Wikipedia | None |
| Citizendium | English | General interest,wiki | Active | Free,copyleft | CC BY NC SA 3.0 | None | None |
| Conservapedia[3][4] | English | American conservative andChristian interests | Active | Free | Unknown | None | None |
| Scholarpedia | English | Articles are written by scholars andpeer-reviewed for accuracy | Active | Free | CC BY NC SA 3.0 | None | None |
| Encyclopædia Britannica | English | General interest | Active | Limited free access and features,subscription for full access | Unknown | None | None |
| Baidu Baike | Chinese | Collaborative online encyclopedia hosted by the major Chinese search engine companyBaidu | Active | Free | Unknown | None | None |
| Enciklopedio Kalblanda | Esperanto | General interest. The first online encyclopedia inEsperanto | Defunct | None | CC BY SA 3.0, GFDL | None | Esperanto Wikipedia |
| EcuRed | Spanish | General interest. Cuban | Active | Free | None | None | None |
| Encyclopedia.com | English | General interest | Active | Free | None | None | None |
| Baike.com | Chinese | General interest. China's largest wiki | Active | Free | Unknown | None | None |
| Brockhaus Enzyklopädie | German | General interest | Active | Limited free access and features,subscription for full access | Unknown | None | None |
| Columbia Encyclopedia | English | General interest | Active | Free[5] | Unknown | None | None |
| Crnogorska Enciklopedija | Montenegrin | General interest (hopes to encourage a Montenegrin language Wikipedia) | Defunct | None | Unknown | None | None |
| Croatian Encyclopedia | Croatian | General and national encyclopedia | Active | Free | Unknown | None | None |
| Den Store Danske Encyklopædi | Danish | General interest | Active | Free | Unknown | None | None |
| Digital Universe | English | Collection of articles on educational, cultural, and scientific topics | Defunct | Free | Unknown | None | None |
| Doosan Encyclopedia | Korean | General interest | Active | Free | Unknown | None | None |
| Ekşi Sözlük | Turkish | General interest | Active | Free | Unknown | None | None |
| Encarta (1993–2009) | English | General interest | Defunct | None | Unknown | None | None |
| Enciclonet | Spanish | General interest | Active | Limited free access and features,subscription for full access | None | None | None |
| Encyclopædia Britannica 11th Edition (1910–11) | English | General interest | Defunct | Public domain: completely free access from several online sources | None | None | None |
| Encyclopedia of China | Chinese | General interest | Active | Subscription | Unknown | None | None |
| Từ điển bách khoa Việt Nam | Vietnamese | General interest. State-sponsored encyclopedia. | Active | Free | Unknown | None | None |
| Encyklopedia Internautica | Polish | General interest | Active | Free | Unknown | None | None |
| Enciclopedia Libre Universal en Español | Spanish | Fork of the Spanish Wikipedia, usingwiki software, released under theGFDL | Defunct | Free,copyleft | Unknown | None | None |
| Encyclopædia Universalis | French | General interest encyclopedia published byEncyclopædia Britannica | Active | Subscription | Unknown | None | None |
| Everything2 | English | General interest, users can submit articles on the topic of essentially anything | Active | Free | None | None | None |
| The Free Dictionary | English, Spanish, German, French, Italian, Chinese, Portuguese, Dutch, Norwegian, Greek, Arabic, Polish, Turkish, Russian | TheFreeDictionary's Encyclopedia draws from various sources, includingThe Columbia Encyclopedia. | Active | Free | None | None | None |
| GNE | English | General interest articles are released under a GNU license. FormerlyGNUpedia. | Defunct | None | Unknown | None | None |
| Gran Enciclopèdia Catalana | Catalan | General interest | Active | Free | Unknown | None | None |
| Grand Larousse encyclopédique | French | General interest | Active | Free | None | None | None |
| Great Norwegian Encyclopedia | Norwegian (Bokmål) | General interest | Active | Free | Unknown | None | None |
| Great Russian Encyclopedia | Russian | General interest | Active | Free | Unknown | None | None |
| Great Soviet Encyclopedia | Russian, English | General interest, often from the former official Soviet viewpoint. | Active | Free | Unknown | None | None |
| Hamichlol | Hebrew, English | General interest, designed forHaredim | Active | Free.Copyleft: mirror of Wikipedia content; copyright: original content. | Unknown | Wikipedia | None |
| Internetowa encyklopedia PWN | Polish | General interest | Active | Free | Unknown | None | None |
| Krugosvet (Rus. Кругосвет) | Russian | General interest. | Active | Free | Unknown | None | None |
| Marathi Vishwakosh | Marathi | General Interest | Active | Free | Unknown | None | None |
| Marefa | Arabic | General interest | Active | Free | Unknown | None | None |
| Mawdoo3 | Arabic | General interest | Active | Free | Unknown | None | None |
| Metapedia | Hungarian, German, English, Spanish,Swedish,Romanian,Estonian, French,Slovenian,Czech,Portuguese,Norwegian,Danish,Greek,Dutch | Far right-wing,white nationalist andneo nazi encyclopedia[6][7][8][9][10][11] | Active | Free | Unknown | None | None |
| Meyers Konversations-Lexikon 4. ed. 1888 - 1892 | German | General interest | Defunct | access from several online sources | Unknown | None | None |
| Namuwiki | Korean | General interest | Active | Free | CC-BY-NC-SA 2.0 KR | Rigveda Wiki | None |
| Nationalencyklopedin | Swedish | General interest, comprehensive | Active | Subscription | Unknown | None | None |
| New World Encyclopedia | English | Project of theUnification movement | Active | Free. Wikipediafork. | CC BY SA 3.0, GFDL | Wikipedia | None |
| Oeconomische Encyclopädie (1773-1858) | German | General interest | Defunct | Public domain: completely free access from several online sources | None | None | None |
| Oxford Bibliographies Online | English | Active | Free | Unknown | None | None | |
| Proleksis Encyclopedia | Croatian | General and national encyclopedia | Active | Free with registration | Unknown | None | None |
| Ruwiki | Russian | General interest, forked from Russian Wikipedia during theRusso-Ukrainian war | Active | Free | CC BY-SA 4.0 | Russian Wikipedia | None |
| Rigveda Wiki | Korean | General interest | Active | Free | CC-BY-NC-SA 2.0 KR | None | None |
| Sarvavijnanakosam | Malayalam | General interest | Active | Free | Unknown | None | None |
| Sogou Baike | Chinese | Collaborative online encyclopedia hosted by the major Chinese search engine companySogou | Active | Free | Unknown | None | None |
| Superpedia | Indonesian,Sundanese,Javanese | General interest | Active | Free | Unknown | None | None |
| Susning.nu (2001–09) | Swedish | A Swedish language wiki | Defunct | None | Unknown | None | None |
| Tamil Encyclopedia | Tamil | General Interest | Active | Free | Unknown | None | None |
| Treccani | Italian | General interest | Active | Free | None | None | None |
| Veropedia | English,Dutch, Spanish | Mirrors stable versions of selectedEnglish Wikipedia articles | Defunct | None | Unknown | None | None |
| Visuotinė lietuvių enciklopedija | Lithuanian | General interest | Active | Free | Unknown | None | None |
| WIEM Encyklopedia | Polish | General interest | Active | Free | Unknown | None | None |
| Winkler Prins | Dutch | General interest, three different age levels | Active | Subscription | Unknown | None | None |
| World Book Encyclopedia | English | General interest | Active | Subscription | Unknown | None | None |
| Klexikon | German | General interest for children aged six to twelve years | Active | Free | CC BY-SA 3.0 | None | None |
| Site | Language | Description | Access |
|---|---|---|---|
| Afro-American Encyclopaedia | English | Classic historical encyclopedia (1895) | Free |
| Australian Dictionary of Biography | English | Entries on notable Australians who have died | Free |
| Croatian Biographical Lexicon | Croatian | Multi-volume biographical reference work on notable figures from Croatian history | Free |
| Deutsche Biographie | German | Biographies on notable German speaking people | Free |
| American National Biography | English | Biographies of notable Americans | Subscription |
| Dictionary of Irish Architects | English | Biographical information on Irish architects from 1720 to 1940 | Free |
| Kdo byl kdo | Czech | Biographies on notableCzech andSlovak people | Free |
| Österreichisches Biographisches Lexikon 1815–1950 | German | Biographies on notable Austrians | Free |
| Oxford Dictionary of National Biography | English | Comprehensive 66-volume reference work on notable figures from British history | Subscription |
| Dictionary of New Zealand Biography | English,Māori | Entries on notable New Zealanders who have died | Free |
| Dizionario Biografico degli Italiani | Italian | Biographical Dictionary of Italian People, published by theIstituto dell'Enciclopedia Italiana Treccani | Free |
| Site | Language | Description | Access |
|---|---|---|---|
| Dictionary of Art Historians | English | Covers topics relating toart historians,art critics, and their dictionaries | Free |
| Dictionary of Greek and Roman Antiquities | English | Incorporates text from the 19th-century encyclopedia of the same name. Focuses on topics of cultural and historical Greek andRoman significance. | Free |
| Dictionary of Greek and Roman Biography and Mythology | English | Focuses on topics dealing with Greek and Roman mythology and people | Free |
| Dictionary of Greek and Roman Geography | English | Focuses on topics relating to Greek and Roman geography | Free |
| Enciclopedia Dantesca | Italian | Devoted toDante Alighieri and his time, by theIstituto dell'Enciclopedia Italiana Treccani | Free |
| The Encyclopedia of Fantasy | English | [12] | Free |
| Encyclopedia Mythica | English | Covers folklore, mythology, and religion.[13] | Free |
| Harper's Dictionary of Classical Literature and Antiquities | English | Covers subjects of classical antiquity; text from 1898 | Free |
| The History of Nordic Women's Literature | English, Danish, Swedish | Searchable online English-language version including many biographies | Free |
| Kindlers Literatur Lexikon | German | Online-only since 2009, covers works and writers ofworld literature | Subscription |
| The Literary Encyclopedia | English | Literature related articles | Subscription |
| Oxford Art Online | English | Visual art; formerlyGrove Art Online andThe Dictionary of Art. Originally published in 1996 as a 34-volume printed encyclopedia; offered online since 1998. | Subscription[14] |
| SIKART | English, German, French, Italian | Biographical dictionary and database of Swiss visual art | Free |
| Site | Language | Description | Access |
|---|---|---|---|
| Agropedia | Covers topics related toagriculture in India | ||
| Austria-Forum | German, English | Online database of Austrian culture | Free |
| Banglapedia | Bengali, English | Bangladesh-related topics | Free |
| The Canadian Encyclopedia | English, French | General interest regardingCanada andCanadiana (original content of the hard copyCanadian Encyclopedia) | Free |
| Chalo Chatu | English | Collaborative online encyclopedia hosted by Chalo Chatu Foundation featuring comprehensive articles on Zambianculture andhistory, etc. | Free |
| Culinary Heritage of Switzerland | German, French, Italian, Romansh | Online encyclopedia of traditionalSwiss cuisine and produce.[15] | Free |
| DEDI | English,Slovene | Online encyclopedia of the natural andcultural heritage ofSlovenia, operated by theSlovenian Academy of Sciences and Arts Scientific Research Center.[16] | Free |
| Dictionary of Sydney | English | Articles on the history and culture ofSydney, Australia | Free |
| Encyclopaedia of Islam, 3rd edition | English | About theIslamic world, not a Muslim encyclopedia | Subscription |
| Encyclopædia Iranica | English, plans for a futurePersian version | Topics onIranology and the influence of theIranian peoples throughout history | Free |
| The Encyclopaedia of Korea[17] | English | Korea-related topics[18] | Free |
| Encyclopedia of Korean Culture | Korean | Korea-related topics | Free |
| Encyclopedia Sindhiana | Sindhi | General interest regardingSindh | Limited free access and features |
| Internet Encyclopedia of Ukraine | English | Ukraine, its history, people, geography, society, economy, and cultural heritage, based on the five-volume printEncyclopedia of Ukraine | Free |
| Gazetteer for Scotland | English | Articles on the geography and locations ofScotland | Free |
| Historical Dictionary of Switzerland | French, German and Italian | Articles on the history of Switzerland. | Free (without illustrations) |
| Kodansha Encyclopedia of Japan | English | Comprehensive articles onJapanese arts,culture,history, andpolitics, etc. | Subscription |
| Oslo byleksikon | Bokmål (Norwegian) | Online encyclopedia ofOslo, operated by theSociety for Oslo Byes Vel, with an emphasis on places, buildings and historical events.[19] | Free |
| Panyathai | Thai, limited English | General interest. Designed to honor the Thai kingBhumibol Adulyadej | Free |
| Sahapedia | English | Open encyclopedic resource on the arts, cultures, and histories of India.[20] | Free |
| Te Ara: The Encyclopedia of New Zealand | English,Māori | Site operated by theNew Zealand government regarding information about the country | Free |
| Vienna History Wiki | German | Articles on the history of the city ofVienna, Austria. Includes 31,000 entries from the 2nd edition ofHistorisches Lexikon Wien. | Free |
| Turkpidya | English, German, Danish, Spanish, French, Italian, Hungarian, Dutch, Portuguese, Romanian, Turkish, Croatian, Polish, Czech, Greek, Bulgarian, Russian, Serbian, Hebrew, Arabic, Persian, Japanese, and Korean. | Online encyclopedia aboutTurkey andTurkic Nations | Free |
| Unam Wiki | Korean | Wiki with statedSouth Korean conservative leanings.[21] | Free |
| Site | Language | Description | Access |
|---|---|---|---|
| 64 Parishes | English | Online encyclopedia of Louisiana, run by theLouisiana Endowment for the Humanities.[22] | Free |
| Encyclopedia of Alabama | English | Encyclopedia covering the state ofAlabama, sponsored by theAlabama Humanities Foundation. | Free |
| Encyclopedia of Appalachia | English | Dedicated to the region, people, culture, history, and geography ofAppalachia. | Defunct |
| Encyclopedia of Arkansas | English | Project of theCentral Arkansas Library System and is the only U.S. state encyclopedia sponsored by a public library | Free |
| Encyclopedia of Chicago | English | Free | |
| Encyclopedia Virginia | English | Encyclopedia funded by theVirginia Foundation for the Humanities andLibrary of Virginia, covering topics onVirginia | Free |
| Handbook of Texas | English | Articles on the U.S. State ofTexas | Free |
| HistoryLink | English | Articles aboutWashington state history | Free |
| MNopedia | English | Online encyclopedia aboutMinnesota, published by theMinnesota Historical Society.[23] | Free |
| NCPedia | English | Encyclopedia coordinated and managed by theNorth Carolina Government andState Library of North Carolina, covering a broad spectrum of topics and resources aboutNorth Carolina.[24] | Free |
| New Georgia Encyclopedia | English | Articles on the U.S. stateGeorgia | Free |
| The Oregon Encyclopedia | English | Articles aboutOregon | Free |
| Tennessee Encyclopedia | English | Covers the state ofTennessee | Free |
| Site | Language | Description | Access |
|---|---|---|---|
| Don Markstein's Toonopedia | English | Focuses on articles about print and animated cartoons | Free |
| The Encyclopedia of Science Fiction | English | Authors, books, films of sci-fi. | Free |
| Emojipedia | English | Emoji | Free |
| Fringepedia | English | Contains articles about the American television dramaFringe. | Free |
| h2g2 | English | Collection of sometimes humorous encyclopedia articles, based on Douglas Adams'sThe 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 dramaHeroes. | Free |
| Know Your Meme | English | A website and video series which uses wiki software to document variousInternet memes and other online phenomena, such asviral videos,image macros,catchphrases, andinternet celebrities.[25][26] | Free |
| Lostpedia | English, German, Spanish, French, Italian, Japanese,Dutch,Polish,Portuguese, Russian, Chinese | Contains articles pertaining to the hit dramaLost | Free |
| Memory Alpha | English,Bulgarian,Catalan,Czech, German,Esperanto, Spanish, French,Italian,Japanese,Dutch,Polish,Portuguese,Romanian, Russian,Serbian,Swedish,Ukrainian, Chinese | Articles aboutStar Trek | Free |
| Minecraft Wiki | English,Russian,Chinese,Portuguese,Japanese,German,French,Spanish,Ukrainian,Literary Chinese,Korean,Polish (unaffiliated[27]),Dutch,Italian,Thai | "Website for gathering useful information related to theMinecraft franchise".[28] | Free |
| LyricWiki (2006–20) | Multilingual | Wiki-basedlyrics database and encyclopedia | Defunct |
| Pixiv Encyclopedia | Japanese | Japanese pop-culture encyclopedia | Free |
| The Rocklopedia Fakebandica | English | Articles on fake bands from popular entertainment | Free |
| Supernatural Wiki | English | Contains articles about the American television dramaSupernatural. | Free |
| Tolkien Gateway | English | J.R.R. Tolkien-related articles | 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 |
| Fallout Wiki | English, German, Spanish, Bulgarian,Finnish, French,Georgian,Hungarian, Italian, Japanese, Korean,Lithuanian, Dutch,Norwegian,Polish, Portuguese, Russian, Swedish,Turkish, Chinese | Fallout-related articles | Free |
| Wookieepedia | English, German, Spanish,Bulgarian,Danish,Finnish, French,Croatian,Hungarian, Italian, Japanese, Dutch,Norwegian,Polish, Portuguese, Russian,Romanian,Slovak,Slovene, Swedish, Turkish, Chinese | Star Wars-related articles | Free |
| Wowpedia /Warcraft Wiki | 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 | Warcraft-related articles | Free |
| Site | Language | Description | Access |
|---|---|---|---|
| Encyclopedia of Mathematics | English | Encompasses articles on the topic ofmathematics | Free |
| Encyclopedia of Triangle Centers | English | Information about ten thousands oftriangle centers, includingcoordinates,operations,incidence,equations, etc. | Free |
| EqWorld | English, Russian | Articles on mathematicalequations | Free |
| MathWorld | English | Articles on a wide variety ofmathematics related topics | Free |
| On-Line Encyclopedia of Integer Sequences | English | Information about hundred thousands ofintegersequences, includingformulas, relatedsequences,programs, etc. | Free/CC BY-NC 3.0 |
| PlanetMath | English | Mathematics related topics and articles | Free/GNU |
| Stacks Project | English | A mathematics textbook writing project with the aim to cover "algebraic stacks and thealgebraic geometry needed to define them" | Free |
| nLab | English | Category theory and related topics | Free |
| Site | Language | Description | Access |
|---|---|---|---|
| Bulgarian Rock Archives | Bulgarian | Archives of Bulgarianrock bands. | Free |
| Canadian Pop Music Encyclopedia | English | Encyclopedia of Canadian pop music | Free[29] |
| Encyclopaedia Metallum | English | Archives ofheavy metal bands | Free |
| Grove Music Online | English | Mostly on historic and classical music worldwide. It is the online version ofThe New Grove Dictionary of Music and Musicians, which has 20 printed volumes and was first published in 1980. | Subscription[14] |
| IMDb | English, German, French, Hungarian, Italian, Polish, Portuguese, Romanian, Turkish, and Spanish | Information related to worldfilms,television programs,home videos,video games, and internetstreams | Free |
| Liquipedia | English, Russian, German, French, Dutch, Swedish | Coversesports in over sixty different games | Free |
| MusicBrainz | English, German, French, Italian, Dutch | An open music encyclopedia that collects musicmetadata.[30] | Free |
| MOOMA | Hebrew | Articles onIsraeli music and musical artists | Free |
| PCGamingWiki | English | CoversPC gaming | Free |
| Prog Archives | English | Archives ofprogressive rock bands | Free |
| Rate Your Music | English | Online encyclopedia of music releases | Free |
| Rock in China | English | Documents and archives contemporaryChinese music, ranging fromrock music topunk,metal, electro, jazz andhip-hop | Free |
| Site | Language | Description | Access |
|---|---|---|---|
| Stanford Encyclopedia of Philosophy | English | Philosophy subjects | Free |
| Routledge Encyclopedia of Philosophy | English | Philosophy articles | Subscription |
| Internet Encyclopedia of Philosophy | English | Philosophy related articles | Free |
| Marxists Internet Archive | Multilingual | Topics related to the study ofMarxism | Free |
| Site | Language | Description | Access |
|---|---|---|---|
| Ballotpedia | English | American politics, elections, and public policy | Free |
| The Concise Encyclopedia of Economics | English | Economics – part of theLibrary of Economics and Liberty. Edited byDavid R. Henderson | Free |
| Cyclopaedia of Political Science, Political Economy, and the Political History of the United States | English | Articles about science, economics, and American authors. The 1899 edition is available online | Free |
| Diplopedia | English | US State Department internal encyclopedic wiki, available for diplomats and overseas US agents to use | Access only through the State Department |
| dKosopedia | English | Political encyclopedia written from aprogressive/liberal Democratic point of view | Free |
| Encyclopedia Titanica | English | Encyclopedia related to the building and sinking of the RMSTitanic | Free |
| Encyclopedia of World Problems and Human Potential | English | Presents articles on perceived human problems | Free |
| Gapminder | English | Historical global trends in health, poverty, and demographics | Free |
| glbtq.com | English | Gay, lesbian, bisexual, transgender, and queer culture. | Free |
| HistoryLink | English | Articles on the history ofWashington state | Free |
| Holocaust Encyclopedia | English,Arabic,Persian, French, Spanish | Holocaust-related articles, published by the United States Holocaust Memorial Museum | Free |
| JurisPedia | Arabic, English, Chinese, French, German, Spanish,Dutch | An academic encyclopedia on the concepts of law | Free |
| Max Planck Encyclopedia of Public International Law | English | Encyclopedia onpublic International Law | Free |
| Online Encyclopedia of Mass Violence | French | Electronic database focusing onmassacres andgenocides of the 20th century.[31] | Free |
| Our World in Data | English | Global trends on economic growth, poverty, health, war, violence, education, and demographics | Free |
| Spartacus Educational | English | Free | |
| World History Encyclopedia | English | The world's most-read history encyclopedia, coveringworld history from all time periods; reviewed by an editorial team, not a Wiki.[32] | Free |
| Site | Language | Description | Access |
|---|---|---|---|
| AhmadiPedia | English | Dedicated to the study of the WorldwideAhmadiyya Muslim Community. | Free, public domain |
| Catholic Encyclopedia | English | Topics relating toCatholicism, text from 1913 and 1922 | Free, public domain |
| Christian Cyclopedia | English | Collection of historical and theological information | Free |
| Easton's Bible Dictionary | English | Articles on Christianity and theology | Free, public domain |
| Encyclopaedia Biblica | English | Contains articles about "the Literary, Political and Religious History, the Archaeology, Geography, and Natural History of the Bible" | Free |
| Encyclopedia of Mormonism | English | Articles byMormon academics onhistory anddoctrine ofthe Church of Jesus Christ of Latter-day Saints (LDS Church). | Free |
| Global Anabaptist Mennonite Encyclopedia Online | English | Topics relating toAnabaptism andMennonites | Free |
| Halachipedia | English | Topics relating toJewish Law. | Free |
| İslâm Ansiklopedisi | Turkish | Articles on topics concerningIslamic studies. | Free |
| The Jewish Encyclopedia | English | Topics relating toJudaism | Free |
| Jewish Virtual Library | English | Portals to essentialJewish topics | Free |
| Encyclopedia Mythica | English | Covers folklore, mythology, and religion.[13] | Free |
| Punjabipedia | Punjabi | Entries on Sikhism | Subscription |
| Schaff–Herzog Encyclopedia of Religious Knowledge | English | Christian, published 1908–1914 | Free, public domain |
| WikiShia | Various | Shia Islam, published since 2013 | Free |
| Site | Language | Description | Access |
|---|---|---|---|
| Encyclopedia Astronautica | English | Contains articles on the subject ofspace exploration andastronomy, no longer updated since 2019 | Free |
| Encyclopedia of Earth | English | Articles on the Earth and its ecosystems | Free |
| Engineering and Technology History Wiki | English | The history of technology, a partnership between the United Engineering Foundation, and theAIChE, AIME,ASCE,ASME,IEEE, SPE, and SWE | Free |
| Free On-line Dictionary of Computing | English | Computing and related subjects | Free |
| Glottopedia | English | Linguistics | Free |
| Javapedia | English | Coverage of all topics related to theJava Platform | Free |
| Omniglot | English | Covers languages and writing systems. | Free |
| Proteopedia | English | Wiki-based 3D encyclopedia ofproteins and othermolecules. | Free |
| RP Photonics Encyclopedia | English | Laser technology,photonics, and various other areas ofphotonics such asnonlinear optics, non-laser light sources,fiber optics, andultrashort pulses of light. | Free |
| ScienceWorld | English | Covers astronomy, scientific biography, chemistry, and physics. LikeMathWorld, it is edited byEric Weisstein. | Free |
| Site | Language | Description | Access |
|---|---|---|---|
| Animal Diversity Web | English | Student wiki-type database at theUniversity of Michigan of animal natural history, distribution, classification, and conservation biology. | Free |
| APpedia | Chinese | Contains articles on the subject of generalanimal protection | Free |
| ARKive | English | Visual and audio recordings of the world's species | Defunct |
| 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 thenatural andsocial sciences | Subscription |
| Erowid | English | Information aboutpsychoactive substances | Free |
| FishBase | English, Spanish,Portuguese, French, German, Italian,Dutch, Chinese (Simplified Han),Chinese (Traditional Han),Greek,Swedish, Russian,Persian,Vietnamese,Thai,Lao,Hindi,Bengali | Articles on fish species | Free |
| Flora Europaea | English | Covers different plant species | Free |
| King Abdullah Bin Abdulaziz Arabic Health Encyclopedia | Arabic, English | Health encyclopedia | Free |
| Palaeos | English | Coverspalaeontology | Free |
| World Flora Online | English | Covers the world's plant species | Free |
| Wikispecies | English | Seeks to create a catalog of all living things | Free |
| ZipcodeZoo | English | Encyclopedia of all living things | Defunct |
| Site | Language | Description | Access |
|---|---|---|---|
| Ganfyd | English | Onlinemedical wiki | Defunct |
| Radiopaedia | English | Articles onmedical imaging used inradiology andradiography | Free |
| WikEM | English | Anemergency medicine open-access source[33] | Free |
