Arabic Bulgarian Chinese Croatian Czech Danish Dutch English Estonian Finnish French German Greek Hebrew Hindi Hungarian Icelandic Indonesian Italian Japanese Korean Latvian Lithuanian Malagasy Norwegian Persian Polish Portuguese Romanian Russian Serbian Slovak Slovenian Spanish Swedish Thai Turkish Vietnamese
Arabic Bulgarian Chinese Croatian Czech Danish Dutch English Estonian Finnish French German Greek Hebrew Hindi Hungarian Icelandic Indonesian Italian Japanese Korean Latvian Lithuanian Malagasy Norwegian Persian Polish Portuguese Romanian Russian Serbian Slovak Slovenian Spanish Swedish Thai Turkish Vietnamese

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List of online encyclopedias

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This is a list of notable online encyclopedias which are accessible on the World Wide Web.


General reference

Baidu BaikeChineseCollaborative online encyclopedia hosted by the major Chinese search engine BaiduFree
BanglapediaBangla, EnglishGeneral interestFree
The Canadian EncyclopediaEnglish, FrenchGeneral Interest (original content of the hard copy Canadian Encyclopedia)Free
Chinese EncyclopediaChineseGeneral interestFree
CitizendiumEnglishWiki-based free encyclopedia project spearheaded by Larry Sanger, co-founder of WikipediaFree
Columbia EncyclopediaEnglishGeneral interestFree
Compton's EncyclopediaEnglishGeneral interestFree
ConservapediaEnglishSemi-open wiki written from politically right-wing and Biblical literalist perspectives.Free
Credo ReferenceEnglishGeneral interest and subject-specific encyclopediasSubscription
Crnogorska EnciklopedijaMontenegrinGeneral interest (hopes to encourage a Montenegrin language Wikipedia)Free
Den Store Danske EncyklopædiDanishGeneral interestFree
Deu SözlükTurkishGeneral interestFree
Digital UniverseEnglishCollection of articles on educational, cultural, and scientific topicsFree
DiplopediaEnglishUS State Department internal encyclopedic wiki, available for diplomats and overseas US agents to useAccess only through the State Department
Doosan EncyclopediaKoreanGeneralFree
Ekşi SözlükTurkishGeneral interestFree
EncartaEnglishGeneral interestDefunct
Encyclopædia BritannicaEnglishGeneral interestLimited free access and features, subscription for full access
Encyclopædia Britannica –1911 EditionEnglishGeneral interestPublic domain: completely free access from several online sources
Encyclopedia of ChinaChineseGeneral interestSubscription
Encyklopedia InternauticaPolishGeneral interestFree
Enciclopedia LibreSpanishFork of the Spanish Wikipedia, using wiki software, released under the GFDLFree
Enciclopedia RomânieiRomanianCollaborative encyclopedia about Romania.Free
Encyclopædia UniversalisFrenchGeneral interest encyclopedia published by Encyclopedia BritanicaSubscription
Everything2EnglishGeneral interest, users can submit articles on the topic of essentially anythingFree
FAQEnglishA collection of searchable FAQsFree
Gale Virtual Reference LibraryEnglishDatabase for search of source material of an academic natureSubscription
GNUPediaEnglishGeneral interest articles are released under a GNU licenseFree
Grand Larousse encyclopédiqueFrenchGeneral interestFree
Grolier Multimedia EncyclopediaEnglishTargeted at the younger researcher, it contains the text of the American Academic EncyclopediaSubscription
Holocaust EncyclopediaEnglish, Arabic, Farsi, French, SpanishHolocaust related articlesFree
HudongChineseGeneral interest. China's largest wikiFree
Hutchinson EncyclopediaEnglishGeneral interestFree
InfopleaseEnglishGeneral interestFree
Internetowa encyklopedia PWNPolishGeneral interestFree
InterpediaEnglishGeneral interest, the first site to propose a free encyclopedia written by users. Now defunct.No longer exists
Kalb EncyclopediaEsperantoGeneral interest. The first online Esperanto encyclopediaFree
Kdo byl kdoCzechBiographies on notable Czech and Slovak peopleFree
KeyinpediaChineseGeneral interestFree
KnolEnglishGeneral interestFree
Kussmaul EncyclopediaEnglishGeneral interest with emphasis on science and the arts. First commercial online encyclopedia (1981-93).Subscription
MarefaArabicGeneral interestFree
Meyers Konversations-Lexikon 4. ed. 1888 - 1892GermanGeneral interestFree
NationalencyklopedinSwedishGeneral interest, the most comprehensive contemporary Swedish language encyclopediaSubscription
New World EncyclopediaEnglishGeneral interestFree
NupediaEnglishCombined with GNUpediaFree
Open SiteEnglishCategorized community-built encyclopedia, inspired by the Open Directory ProjectFree
Private SözlükTurkishCollaborative hypertext Turkish dictionary and encyclopedia site that shares a similar concept with Everything2 or H2G2Free
Probert EncyclopaediaEnglishGeneral interestFree
QuidFrenchGeneral interestFree
ScholarpediaEnglishArticles are written by scholars and peer-reviewed for accuracyFree
Store norske leksikonNorwegian (Bokmål)General interestFree
Susning.nuSwedishA Swedish language wikiFree
Từ điển Bách khoa toàn thư Việt NamVietnameseGeneral interest. State-sponsored encyclopedia.Free
VeropediaEnglish, Dutch, SpanishMirrors stable versions of selected English Wikipedia articlesFree
VikidiaFrench, SpanishArticles designed for children ages 8-13Free
WIEM EncyklopediaPolishGeneral interestFree
WikipediaSee list hereWiki-based free general interest encyclopediaFree, Copyleft
WikiPilipinasEnglishBased on the Wikipedia model, from the Philippines point-of-viewFree
World Book EncyclopediaEnglishGeneral interestSubscription


Australian Dictionary of BiographyEnglishEntries on notable Australians who have diedFree
Dictionary of Greek and Roman Biography and MythologyEnglishFocuses on topics dealing with Greek and Roman mythology and peopleFree
Dictionary of New Zealand BiographyEnglish, MaoriEntries on notable New Zealanders who have diedFree
glbtq.comEnglishEntries on notable homosexualsFree
MacTutor History of Mathematics archiveEnglishBiographies of mathematiciansFree
MyWikiBizEnglishA wiki encyclopedia that allows people and enterprises to write about themselvesFree

Classical antiquities, arts, and literature

A Dictionary of Greek and Roman AntiquitiesEnglishIncorporates text from the 19th century encyclopedia of the same name. Focuses on topics of cultural and historical Greek and Roman significance.Free
Encyclopedia MythicaEnglishContains articles on mythology, folklore, and religionFree
Harpers Dictionary of Classical AntiquitiesEnglishCovers subjects of classical antiquityFree
The Literary EncyclopediaEnglishLiterature related articlesSubscription
SIKARTEnglish, German, French, ItalianBiographical dictionary and database of Swiss visual artFree

Culture and country-specific

Aeiou EncyclopediaGerman, EnglishOnline database of Austrian cultureFree
ArmeniapediaEnglish, ArmenianOnline encyclopedia of anything pertaining to Armenia and Armenians.Free
Dictionary of Greek and Roman GeographyEnglishFocuses on topic relating to Greek and Roman geographyFree
Encyclopedia of AlabamaEnglishArticles on the state of AlabamaFree
Encyclopedia IranicaEnglish, plans for a future Persian versionTopics on the influence of the Iranian peoples throughout historyFree
Encyclopedia of Korean CultureKoreanKorea-related topicsFree
Encyclopedia of UkraineEnglishUkraine related articlesFree
Encyclopedia of World Problems and Human PotentialEnglishPresents articles on perceived human problemsFree
Gazetteer for ScotlandEnglishArticles on the geography and locations of ScotlandFree
Jewish EncyclopediaEnglishThe state of Judaism and the Jews as of 1901Free, Public domain
Jewish Virtual LibraryEnglishPortals to essential Jewish topicsFree
Kodansha Encyclopedia of JapanEnglishComprehensive articles on Japanese arts and culture, history and politics, etc.Subscription
New Georgia EncyclopediaEnglishArticles on the U.S. state GeorgiaFree
Oregon Blue BookEnglishArticles pertaining to OregonFree
The Oregon EncyclopediaEnglishArticles pertaining to OregonFree
PanyathaiThai, limited EnglishGeneral interest. Designed to honor the Thai king Bhumibol AdulyadejFree
TAGIPEDIAArabic, EnglishArticles on Arab heritage and contentFree with registration
Te Ara Encyclopedia of New ZealandEnglish, MāoriThe New Zealand government site with content on the countryFree
Encyclopedia VirginiaEnglishArticles on Virginia's history and cultureFree

Pop culture and fiction

Battlestar WikiEnglish, Simple English, German, Spanish, Turkish, Malay, French, ChineseBattlestar Galactica-related articlesFree
Don Markstein's ToonopediaEnglishFocuses on articles pertaining to print and animated cartoonsFree
H2G2EnglishCollection of sometimes humorous encyclopedia articles, based on Douglas Adams's The Hitchhiker's Guide to the Galaxy.Free
Heroes WikiEnglish, Dutch, French, German, Hebrew, Italian, Portuguese, Spanish, Swedish, TurkishContains articles pertaining to the American television drama Heroes.Free
LambiekEnglish, DutchArticles on comic strips and comic artistsFree
LostpediaEnglish, German, Spanish, French, Italian, Japanese, Dutch, Polish, Portuguese, Russian, ChineseContains articles pertaining to the hit drama LostFree
Memory AlphaEnglish, Bulgarian, Chinese, Czech, Dutch, Esperanto, French, German, Polish, Portuguese, Russian, Serbian, Spanish and SwedishArticles about Star TrekFree
Project Galactic GuideEnglishInspired by The Hitchhiker's Guide to the GalaxyFree
The Rocklopedia FakebandicaEnglishArticles on fake bands from popular entertainmentFree
TvTropesEnglish, German, Esperanto, Spanish, Frrench, Norsk, Suomi, Svenska, Al Bhed, QuenyaArticles related to the devices and conventions that a fiction writer can reasonably rely on as being present in the audience members' minds and expectationsFree
WookieepediaEnglish, German, Spanish, Bulgarian, Danish, Finnish, French, Croatian, Hungarian, Italian, Japanese, Dutch, Norwegian, Polish, Portuguese, Russian, Romanian, Slovak, Slovene, Swedish, ChineseStar Wars related articlesFree
WoWWikiEnglish, 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, ChineseWorld of Warcraft related articlesFree


Cut-the-knotEnglishMathematics related topicsFree
Encyclopaedia of MathematicsEnglishEncompasses articles on the topic of mathematicsFree
EqWorldEnglish, Russian, German, French, Italian, SpanishArticles on mathematical equationsFree
MathWorldEnglishArticles on a wide variety of math related topicsFree
On-Line Encyclopedia of Integer SequencesEnglishEncyclopedia of number sequences (what is next term after 1,2,4,9,20,48,115, ..., say?)Free
PlanetMathEnglishMath related topics and articlesFree/GNU
The QED ProjectEnglishA project to establish a "distributed, computerized repository that rigorously represents all important, established mathematical knowledge."Free


AllmusicEnglishMusic-related topicsRetail sites
DiscogsEnglishDatabase of audio releasesFree
Encyclopaedia MetallumEnglishArchives of heavy metal bandsFree
LyricWikiEnglishEncyclopedic database of song lyricsFree
MOOMAHebrewArticles on Israeli music and musical artistsFree
MusicBrainzEnglishDatabase of audio albumsFree


Encyclopedia of Marxismmulti-lingualTopics related to the study of MarxismFree
Internet Encyclopedia of PhilosophyEnglishPhilosophy related articlesFree
Routledge Encyclopedia of PhilosophyEnglishPhilosophy articlesSubscription
Stanford Encyclopedia of PhilosophyEnglishPhilosophy subjectsFree

Politics and history

Campaigns WikiaEnglishPolitical issues and campaignsFree
CongresspediaEnglishSeeks to improve on public information through articles about US Congress specificsFree
Cyclopaedia of Political ScienceEnglishArticles pertaining to science, economics, and American authors. The 1899 edition is available onlineFree
dKosopediaEnglishA political encyclopedia written from a left/progressive/liberal/Democratic point of viewFree
HistoryLinkEnglishArticles on the history of Washington StateFree
JurispediaArabic, English, Chinese, French, German, Spanish, DutchAn academic encyclopedia on the concepts of lawFree

Religion and theology

Catholic EncyclopediaEnglishTopics relating to CatholicismFree, Public domain
Christian CyclopediaEnglishA collection of historical and theological informationFree
Easton's Bible DictionaryEnglishArticles on Christianity and theologyFree, Public Domain
Encyclopaedia BiblicaEnglishContains articles pertaining to "the Literary, Political and Religious History, the Archaeology, Geography, and Natural History of the Bible"[1]Free
Encyclopedia of MormonismEnglishArticles by Mormon academics on history and doctrine of The Church of Jesus Christ of Latter-day Saints (Mormon or LDS Church).Free
New AdventEnglishArticles on Catholicism and apologeticsFree


Encyclopedia AstronauticaEnglishContains articles on the subject of space exploration and astronomyFree
Encyclopedia of EarthEnglishArticles on the Earth and its ecosystemsFree
JavapediaEnglishCoverage of all topics related to the Java platformFree

Biology-Life science

Animal Diversity WebEnglishStudent wiki-type database at the University of Michigan of animal natural history, distribution, classification, and conservation biology.Free
ARKiveEnglishVisual and audio recordings of the world's speciesFree
Encyclopedia of LifeEnglish, FrenchSeeks to categorize all 1.8 million known species on the planetFree
Encyclopedia of Life SciencesEnglishBiology related articlesSubscription
Encyclopedia of Life Support SystemsEnglishArticles about the natural and social sciencesSubscription
ErowidEnglishInformation about psychoactives substancesFree
FishBaseEnglish, Spanish, Portuguese, French, German, Italian, Dutch, Chinese (Simplified Han), Chinese (Traditional Han), Bahasa Malay, Indonesian, Greek, Swedish, Russian, Farsi, Vietnamese, Thai, Lao, Hindi, BanglaArticles on fish speciesFree
Flora EuropaeaEnglishCovers different plant speciesFree
Macroscopic ObservatoryEnglishCovers Flora and FaunaFree
MicrobeWikiEnglishCovers microbesFree
PalaeosEnglishCovers palaeontologyFree
WikispeciesEnglishSeeks to create a catalogue of all living thingsFree

Medicine and surgery

A list of 69 online medical wiki encyclopedias has been created by David Rothman.[2]

Ask Dr WikiEnglishMedical contentFree
GanfydEnglishMedical contentFree
MedcyclopaediaEnglishArticles on medical imaging used in radiology and radiographyFree
MedpediaEnglishMedical contentFree
RadiopaediaEnglishArticles on medical imaging used in radiology and radiographyFree
WikiDocEnglish, Spanish, Polish, Russian, Romanian, Chinese, Turkish and FrenchMedical contentFree
WikiSurgeryEnglishSurgical contentFree

See also


External links


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The English word games are:
○   Anagrams
○   Wildcard, crossword
○   Lettris
○   Boggle.


Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.


Boggle gives you 3 minutes to find as many words (3 letters or more) as you can in a grid of 16 letters. You can also try the grid of 16 letters. Letters must be adjacent and longer words score better. See if you can get into the grid Hall of Fame !

English dictionary
Main references

Most English definitions are provided by WordNet .
English thesaurus is mainly derived from The Integral Dictionary (TID).
English Encyclopedia is licensed by Wikipedia (GNU).


The wordgames anagrams, crossword, Lettris and Boggle are provided by Memodata.
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