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50 Best Online Encyclopedias & Knowledge Resources

1 Wikipedia The world’s largest free collaborative encyclopedia, available in hundreds of languages. 2 Encyclopaedia Britannica A renowned general reference encyclopedia covering history, science, culture, geography and biographies. 3 Encyclopedia.com A large reference collection offering encyclopedia articles, biographies and subject resources. 4 Stanford Encyclopedia of Philosophy A scholarly and continuously updated reference work covering philosophy and its major fields. 5 Internet Encyclopedia of Philosophy Free scholarly articles covering philosophers, philosophical ideas, traditions and concepts. 6 World History Encyclopedia A comprehensive history resource covering civilizations, people, places and historical events. 7 Scholarpedia An expert-reviewed encyclopedia covering scientific, mathematical and technical subjects. 8 Citizendium A collaborative encyclopedia emphasizing knowledgeable contributors and editorial oversight. 9 Encyclopedia of Life A global biodiversity resource providing information about animals, plants, fungi and other species. 10 The Canadian Encyclopedia A major reference source covering Canada’s history, geography, people, culture and institutions. 11 Encyclopedia of Mathematics A comprehensive mathematical reference covering concepts, theories, terminology and mathematicians. 12 Internet Encyclopedia of Science An accessible science reference covering astronomy, physics, biology, chemistry and technology. 13 Encyclopedia of Earth Reference information about Earth sciences, environment, ecosystems and sustainability. 14 Encyclopedia of Life Sciences Scholarly life-science reference material covering biology and related scientific disciplines. 15 Britannica Kids Child-friendly educational reference resources designed for young learners. 16 Oxford Reference A major collection of Oxford dictionaries, encyclopedias and academic reference works. 17 Cambridge Reference Cambridge’s online collection of dictionaries, language resources and reference material. 18 Encyclopedia of Chicago Detailed reference material about Chicago’s history, people, neighborhoods and institutions. 19 Encyclopedia Virginia Scholarly reference resource devoted to Virginia’s history, people and culture. 20 New Georgia Encyclopedia Reference source covering Georgia’s history, geography, culture, people and institutions. 21 Tennessee Encyclopedia Encyclopedia dedicated to Tennessee history, culture, people and places. 22 Encyclopedia of Alabama Comprehensive reference covering Alabama’s history, geography, culture and people. 23 Encyclopedia of Greater Philadelphia Historical and cultural reference covering Philadelphia and the surrounding region. 24 Encyclopedia of Arkansas Reference resource covering Arkansas history, geography, communities and culture. 25 Smithsonian Extensive educational collections and reference resources covering science, history, culture and nature. 26 Met Heilbrunn Timeline of Art History Encyclopedic art-history resource covering cultures, periods, artists and artworks. 27 Artcyclopedia Searchable art reference directory covering artists, museums and online art resources. 28 Internet Broadway Database Reference database covering Broadway productions, performers and theatre history. 29 IMDb Major entertainment reference database covering films, television, actors and filmmakers. 30 MusicBrainz Open music encyclopedia and database covering artists, recordings and releases. 31 Discogs Large collaborative music database featuring artists, albums, releases and discographies. 32 Encyclopedia of Mathematics Scholarly mathematics reference covering definitions, concepts, theories and mathematical history. 33 Wiktionary Free multilingual dictionary covering words, meanings, pronunciations, etymology and usage. 34 Wikibooks A free collection of collaboratively written textbooks, manuals and educational books. 35 Wikisource A free digital library containing public-domain and freely licensed texts and documents. 36 Wikinews A collaborative Wikimedia news project providing news reports and current-event coverage. 37 Wikiversity A free learning community offering lessons, courses, learning materials and educational resources. 38 Wikidata A free structured knowledge base containing machine-readable information about millions of entities. 39 Wikivoyage A collaborative travel reference covering destinations, attractions, transportation and travel advice. 40 Wikimedia Commons A huge free media repository containing photographs, maps, illustrations, videos and other resources. 41 Encyclopedia of Religion Reference material covering religions, traditions, beliefs, practices and religious history. 42 Bible Encyclopedia Biblical reference material covering people, places, terms, concepts and subjects in Scripture. 43 Catholic Encyclopedia Reference resource covering Catholic history, theology, saints, teachings and Church traditions. 44 Jewish Encyclopedia Historical encyclopedia covering Jewish religion, history, culture, communities and biographies. 45 New Advent Catholic Encyclopedia Free online edition of the classic Catholic Encyclopedia with thousands of reference articles. 46 Encyclopedia of Science Fiction Major scholarly reference covering science-fiction literature, writers, themes and history. 47 Internet Speculative Fiction Database Bibliographic reference database for science fiction, fantasy and related speculative literature. 48 AllMusic Extensive music reference covering artists, albums, genres, recordings and musical history. 49 Encyclopedia of Life – Species Species-focused biodiversity reference providing information about life on Earth. 50 Google Arts & Culture Digital cultural resource featuring museums, artworks, historical sites and collections from around the world.