| A Million Penguins | Fiction—collaboratively written novel | This wiki no longer exists. | 7002491000000000000491[1] | Copyrighted |
| AboutUs.org | Internet directory | Initially pre-populated with information about many different websites. Uses MediaWiki software, but now largely with Ruby on Rails | 700717611146000000017,611,146 | GFDL and CC-BY-SA |
| Appropedia | English, French, German, Spanish | Sustainable development, including appropriate technology merging with several other wikis | 70034934000000000004,934[2] | CC-BY-SA 3.0 |
| Baidu Baike | Encyclopedic/Chinese | A Chinese encyclopedia | 70062878123000000002,878,123[3] | Copyrighted |
| Ballotpedia | Informative | An interactive almanac of United States politics. | 7005192927000000000192,927[4] | GFDL |
| Biographicon | Misc—Biographies of people | A directory of personal profiles; shut down in 2008 | | Unknown |
| Catawiki | Catalogues | Originally in Dutch, with English version. Collectors specific for comics, coins, stamps, trading cards, board games, model cars, model trains, bank notes, books, watches, Disney memorabilia, clocks and other. | 7005200000000000000200,000 | |
| Citizendium | Encyclopedic | Requires writers to use real names rather than usernames; guided by expert input while allowing edits from the general public | 700415308000000000015,308[5] | CC-by-sa 3.0 |
| Congresspedia | Government—United States Congress | A separately branded sub-section of SourceWatch, since moved to OpenCongress | | CC-BY-SA 3.0 |
| Conservapedia | Encyclopedia | Information and articles are written from a conservative Christian viewpoint aimed at correcting the alleged liberal bias of Wikipedia. | 700433100000000000033,100[6] | Copyrighted (free use) |
| Choral Public Domain Library (CPDL) | Music | A wiki library of free typeset musical scores | 700415382000000000015,382[7] | Public Domain, CPDL Licence, C.C. Licences, Copyrighted (free use) |
| DavisWiki | Place—Davis, California | A city wiki dedicated solely to Davis; at one point the largest city wiki | 700415593000000000015,593[3] | CC-by 3.0 |
| Diplopedia | Government—Diplomacy | Encyclopedia of the U.S. Department of State collecting items related to international relations and diplomacy | | |
| EcuRed | A Cuban perspective on global issues, in Spanish | Run by Cuba's Youth Computer Club, an affiliate of the Communist Youth Union | 700419482000000000019,482 | Compatible with the copyleft license Creative Commons Attribution-ShareAlike 3.0 Unported[8] |
| Ekopedia | Multilingual—Encyclopedic | Environmental sustainability merging with Appropedia. | | CC-BY-SA 3.0 |
| Enciclopedia Libre Universal en Español | Encyclopedic/Spanish | A Spanish language fork of Wikipedia | 700447281000000000047,281[9] | CC-BY-SA 3.0 |
| Encyclopedia Dramatica | Satire of Internet memes | A satirical wiki | 70037400000000000007,400[10] | Fair use |
| Encyclopedia of Mathematics | Mathematics | | at least 8000 | CC-BY-SA 3.0 |
| English Wikipedia | Encyclopedic | Public access, most prominent English wiki | 4,193,423 [11] | CC-BY-SA |
| Everything2 | Personal essays | A wiki-like project for essays | 7005361878000000000361,878[12] | Copyrighted |
| Foodista.com | Reference—Food and Cooking | A Creative Commons structured wiki about foods, recipes, and other culinary information. | | CC-BY |
| Fringepedia | Fiction—Fringe | | | |
| Galaxiki | Fictional galaxy | Dedicated to the creation of a fictional galaxy | | GFDL[13] |
| Gardenology.org | Gardening | Meant as a "complete plant and garden wiki encyclopedia" | Over 19,000 | Creative Commons Attribution ShareAlike |
| GCPEDIA | Government | Internal Government of Canada Wiki | | |
| GeoNames | Places | A geographical database that links specific names with unique features | | |
| Geo-wiki | Global land cover maps | The Geo-Wiki Project is to help improve the quality of global land cover maps. | | |
| Heroes Wiki | Fiction—Heroes | | | CC-NC-ND |
| Hudong (互动百科) | Encyclopedic | Largest Chinese wiki. Social Networking features. Chinese language only | 70063920000000000003,920,000[14] | Copyrighted |
| Intellipedia | Government—Intelligence | Three non-accessible wikis running on networks that link the U.S. intelligence community | | |
| International Music Score Library Project | Music | A wiki library of public domain musical scores | 700414800000000000014,800[15] | GFDL |
| Internet Movie Firearms Database (IMFDb) | Firearm usage in Film, Television and Videogames | Runs on MediaWiki | 7005144339000000000144,339[16] | |
| Javapedia | Computers—Java | An online encyclopedia for developing Java | 7002790000000000000790[17] | Creative Commons |
| Judgepedia | Informative | An interactive encyclopedia of courts and judges. | 7005131112000000000131,112[18] | GFDL |
| JurisPedia | Government—Law | A multi-lingual academic encyclopedia, including Arabic, Chinese, English, French, German and Spanish | | CC-NC |
| Knol | General purpose | A wiki-like technology from Google | 7005100000000000000100,000[19] | CC-by 3.0 |
| Lostpedia | Fiction—Lost | Articles about episodes, characters, themes, etc. in the television show. | 70037248000000000007,248[20] | CC BY-NC-ND |
| LyricWiki | Music—Lyrics | A listing of lyrics by album | 70061147000000000001,147,000[21] | Mostly copyrighted. CC-BY-SA for minority of content. |
| Medpedia | Encyclopedic Medical/health | Requires real names; guided by medical expert input while allowing edits from the general public | | CC-BY-SA |
| MeatballWiki | Communities—Online communities | | 70034900000000000004,900[22] | Copyrighted |
| Memory Alpha | Fiction—Star Trek | Contains canon-only material | 700434331000000000034,331[23] | CC-NC 2.5 |
| MetaBase | database of biological databases | 1000 biological databases and over 800 'web services', more than 50 'user-contributed' databases | 70031800000000000001,800 | BioLicense and MetaBase:Copyrights |
| Metapedia | Encyclopedia | A white nationalist and extreme right-wing online encyclopedia. | 700487521000000000087,521[23] (Hungarian Language version) | unknown |
| MyWikiBiz | Misc—Business directory | Allows people and enterprises to write about themselves | 700411475000000000011,475[24] | GFDL and other[25] |
| OpenStreetMap | Places—Maps | Uses GPS, aerial photography and other free sources of images to create a map of the world | | ODbL 1.0 |
| OpenWetWare | Science—Biology | Promotes sharing and dissemination of knowledge related to biological research | | CC-BY-SA |
| PlanetMath | Misc—Mathematics | Free wiki-style mathematical encyclopedia | | |
| Pornopedia | Sexuality | Multilingual encyclopedia about pornography and sexuality[26] | 700415447000000000015,447[27]
(German version) | Copyrighted |
| RationalWiki | Refuting pseudoscience | | | CC-BY-SA 3.0 |
| riscos.info | Computers—RISC OS | Hosts C programming resources and projects | 7002197000000000000197[28] | cc-by 2.5 |
| Scholarpedia | Encyclopedic | Written exclusively by professionals focusing on their field of expertise; subject to peer review | 70031619000000000001,619[29] | Copyrighted |
| Sensei's Library | Misc—Go (game) | | 700418200000000000018,200 | OPL |
| ShopWiki | Misc—Products | A shopping wiki and product comparison search engine featuring buying guides and shopping resources | | |
| SKYbrary | Aviation safety information | | | |
| SNPedia | Science—Biology | A database of research and information about single-nucleotide polymorphisms, including medical consequences for people who have DNA info about themselves | 70033500000000000003,500[30] | CC-by-nc-sa 3.0 |
| SourceWatch | Social—Propaganda | Formerly Disinfopedia, discusses propaganda and includes organizations that seek to influence public opinion | | GFDL |
| Stadtwiki Karlsruhe | Encyclopedic | Multilingual city wiki for Karlsruhe | 700421157000000000021,157[31] | CC-BY-NC-SA |
| Susning.nu | Encyclopedic/Swedish | A Swedish language encyclopedia, which competes with Swedish Wikipedia | | Copyrighted |
| SWiK | Computers—Open source software | | | |
| TermWiki | Words in different languages | A social learning network built around terms and questions in 75 languages. | 70061417806000000001,417,806[32] | |
| The Student Room | Place—UK University and student life | Offers UK university guides, revision notes, examples of university personal statements and information on student life and university courses | | |
| Travellerspoint | Places—Travel | A social networking site dedicated to sharing stories and recommendations about travel | 70032400000000000002,400[33] | CC-BY-SA 3.0 |
| TV Tropes | Encyclopedic | Focuses on documenting tropes in various media | 163,841 | CC-BY-SA 3.0 |
| Uncyclopedia | Satire—Parody | A group of satirical encyclopedias which parody Wikipedia in multiple languages | 700429548000000000029,548 (in English)[34] | CC-by-nc-sa 2.0 |
| The Vault | Fiction/Gaming—Fallout (series) | Science Fiction wiki; migrated to Curse, inc in 2011 | 700415134000000000015,134[35] | CC-BY-SA |
| Vikidia | Encyclopedic/Spanish and French | A Spanish and French language encyclopedia for children ages 8–13 | | GFDL/CC-BY-SA |
| Wikia | A hosting service for wikis: Wiki farm | Focus on entertainment and gaming wikis. | 70069722480000000009,722,480[36] | |
| WikiAnswers | General knowledge | Compiles answers to questions posed | 700711265000000000011,265,000[37] | Copyrighted |
| Wikibooks | General—textbooks | A wikimedia project | 7005115200000000000115,200[38] | CC-BY-SA/other |
| WikiCandidate | Fictional presidential campaign | A virtual campaign for a fictional U.S. presidential candidate. A project of Cornell University. | | |
| Wikicollecting | Encyclopedia | A free to join community to create an up-to-date and reliable guide to the world of collecting, covering all areas from action figures to wine. | 70032000000000000002,000 | Creative Commons Attribution-ShareAlike 3.0 |
| WikiEducator | Open educational resources | Open educational resources which anyone may use, adapt, and share | 7005110872000000000110,872[39] | CC-BY-SA, and CC-BY |
| wikiHow | General instruction | A how-to manual | 7005133000000000000133,000[40] | CC-by-nc-sa 2.5 |
| WikiMapia | Places—On-line map | Combines Google Maps with a wiki system for polygonally defined areas; currently supports 35 languages | 700713300000000000013,300,000 | CC by-nc-sa[41] |
| Wikimedia Commons | Misc—Electronic media | A repository of free electronic media; a wikimedia project | | CC-BY-SA and other |
| Wikinews | General—News | Collaborative news service, a wikimedia project | | CC-BY |
| Wikipedia | Encyclopedic | Multilingual MediaWiki project | 700718000000000000018,000,000 | CC-BY-SA |
| Wikiquote | Reference—Quotations | A quote repository, a wikimedia project | 7005143302000000000143,302[42] | CC-BY-SA |
| Wikisource | Reference—Primary sources | Dedicated to use on Wikipedia; a wikimedia project | 7005586400000000000586,400[43] | CC-BY-SA |
| Wikispecies | Science—Biology | A directory of species; wikimedia project | 7005248844000000000248,844 | GFDL/CC-BY-SA |
| Wikitravel | Places—Travel | A travel guide using wikimedia's software, but unconnected to the Wikimedia Foundation (which hosts Wikivoyage). 20 supported languages | 700462345000000000062,345[44] | CC-BY-SA 3.0 |
| Wikiversity | General—Self-directed learning | Supports free learning communities, projects, materials, and learners; a wikimedia project | | CC-BY-SA 3.0 |
| Wikivoyage | Places—Travel | A multilingual travel guide of the Wikimedia Foundation. | | CC-BY-SA 3.0 |
| WikiWikiWeb | Computer programming, specifically design patterns | World's oldest wiki (began circa 1995) | 700434997000000000034,997[3] | GPL |
| Wiktenauer | Encyclopedic | An open database dedicated to the masters, manuals, and techniques of Historical European martial arts (HEMA) | 7002397000000000000397[45] | CC-BY-SA-3.0 |
| Wiktionary | Multilingual dictionary | | | |
| Wookieepedia | Fiction—Star Wars | Science fiction encyclopedia | 7005102214000000000102,214[46] | CC-BY-SA |
| WoWWiki | Gaming—Warcraft | Contains in-universe material; migrated to Wowpedia in 2010 | 700495426000000000095,426[47] (WoWWiki); 7005100143000000000100,143[48] (Wowpedia) | CC-BY-SA 3.0 |
| ZineWiki | Social—Independent media | A zine encyclopedia | | |
