| Name | Focus | Notes | Articles | License |
| Wikipedia | Encyclopedic | Umbrella, multilingual MediaWiki project | >&0000000012408000.00000012,408,000 | CC-BY-SA |
| Hudong (互动在线) | Encyclopedic | Largest Chinese wiki. Social Networking features. Chinese language only | >&Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ",".Expression error: Unrecognised punctuation character ","3,230,000 [1] | Copyrighted |
| English Wikipedia | Encyclopedic | Public access, most prominent English wiki | >&Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ","Expression error: Unrecognised punctuation character ",".Expression error: Unrecognised punctuation character ","3,130,230 [2] | CC-BY-SA |
| Citizendium | Encyclopedic | Requires real names; guided by expert input while allowing edits from the general public | >&0000000000010800.00000010,800 [3] | CC-by-sa 3.0 |
| Scholarpedia | Encyclopedic | Written exclusively by professionals focusing on their field of expertise; subject to peer review | &0000000000001619.0000001,619 [4] | Copyrighted |
| Knol | Encyclopedic | A wiki-like technology from Google | >&0000000000100000.000000100,000 [5] | CC-by 3.0 |
| Wikibooks | General—textbooks | A wikimedia project | >&0000000000115200.000000115,200 [6] | GFDL + other |
| NotePub | General purpose | An online notepad that allows for both public and private content. | | |
| Wikiversity | General—Self-directed learning | Supports free learning communities, projects, materials, and learners; a wikimedia project | | GFDL + other |
| wikiHow | General instruction | A how-to manual | >&0000000000066000.00000066,000 [7] | CC-by-nc-sa 2.5 |
| WikiAnswers | General knowledge | Compiles answers to questions posed | >&0000000003625500.0000003,625,500 [8] | Copyrighted |
| Everything2 | Personal essays | A wiki-like project for essays | >&0000000000273900.000000273,900 [9] | Copyrighted |
| MeatballWiki | Communities—Online communities | | >&0000000000004900.0000004,900 [10] | Copyrighted |
| Wikitruth | Social—Criticism of Wikipedia | | >&0000000000000200.000000200 [11] | GFDL |
| Conservapedia | Encyclopedia | Information and articles are written from a Conservative Christian viewpoint aimed at correcting the perceived liberal bias of Wikipedia. Contains allegedly onesided and sometimes faulty information. | >&0000000000030600.00000030,600 [12] | Copyrighted (free use) |
| Encyclopedia Dramatica | Satire of Internet memes | A satirical wiki | >&0000000000007400.0000007,400 [13] | Fair use |
| Uncyclopedia | Satire—Parody | A satirical encyclopedia dedicated to parody | >&0000000000134000.000000134,000[14] | CC-by-nc-sa 2.0 |
| Wikiquote | Reference—Quotations | A quote repository, a wikimedia project | >&0000000000090200.00000090,200 [15] | GFDL |
| Wikisource | Reference—Primary sources | Dedicated to use on Wikipedia; a wikimedia project | >&0000000000586400.000000586,400 [16] | GFDL |
| Wikimedia Commons | Misc—Electronic media | A repository of free electronic media; a wikimedia project | | CC-SA and other |
| Biographicon | Misc—Biographies of people | A directory of personal profiles | | GFDL |
| BMEzine Encyclopedia | Encylopedia | An encyclopedia of body modification and body art | 1,665 [17] | GFDL |
| MyWikiBiz | Misc—Business directory | Allows people and enterprises to write about themselves | | |
| International Music Score Library Project | Music | A wiki library of public domain musical scores | >&0000000000014800.00000014,800 [18] | GFDL |
| LyricWiki | Music—Lyrics | A listing of lyrics by album | >&0000000000722000.000000722,000 [19] | CC-BY-SA |
| Whole Wheat Radio | Music—Indie music | An online community radio station featuring independent music | | |
| Memory Alpha | Fiction—Star Trek | Contains canon-only material | >&0000000000029900.00000029,900 [20] | CC-NC 2.5 |
| WoWWiki | Gaming—Warcraft | Contains in-universe material | >&0000000000078496.00000078,496 [21] | |
| Wookieepedia | Fiction—Star Wars | Science fiction encyclopedia | >&0000000000070000.00000070,000 [22] | GFDL |
| MuseWiki | Music—Muse | Muse related information, biographies of the band and its members, full discography, lyrics, tour schedules and reports, news, tabulatures. | >&0000000000009300.0000009,300 | |
| A Million Penguins | Fiction—collaboratively-written novel | | &0000000000000491.000000491[23] | Copyrighted |
| Galaxiki | Fictional galaxy | Dedicated to the creation of a fictional galaxy | | |
| Lostpedia | Fiction—Lost | | | |
| WikiWikiWeb | Computer programming, specifically design patterns | World's oldest wiki (began circa 1995) | >&0000000000033886.00000033,886 [24] | GPL |
| Javapedia | Computers—Java | An online encyclopedia for developing Java | | |
| SWiK | Computers—Open source software | | | |
| GeoNames | Places | A geographical database that links specific names with unique features | | |
| City wiki | Places | An umbrella term for a variety of wikis dedicated to cities or other geographic regions | | |
| 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 | | |
| DavisWiki | Place—Davis, California | A city wiki dedicated solely to Davis; at one point the largest city wiki | >&0000000000013000.00000013,000 [25] | CC-by 3.0 |
| Dickipedia - A Wiki of Dicks | Satire—Parody | an encyclopedia of satirical biographies "about people who are dicks" | | |
| Galbijim Wiki | Place—South Korea | Written by, and for an audience of South Korean expatriates | | |
| WikiPilipinas | Place—The Philippines | A combined non-academic encyclopedia, web portal, directory and almanac for Philippine-based knowledge | | |
| Travellerspoint | Places—Travel | A social networking site dedicated to sharing stories and recommendations about travel | >&0000000000002400.0000002,400 [26] | CC-SA 3.0 |
| OpenStreetMap | Places—Maps | Uses GPS, aerial photography and other free sources of images to create a map of the world | | CC-SA 2.0 |
| WikiMapia | Places—On-line map | Combines Google Maps with a wiki system; currently supports 35 languages | | |
| Wikitravel | Places—Travel | A travel guide using wikimedia's software, but otherwise unconnected to the Wikimedia Foundation. 20 supported languages | >&0000000000048000.00000048,000 [27] | CC-SA 1.0 |
| World66 | Places—Travel | A formerly Dutch company now owned by Internet Brands | &0000000000046100.00000046,100 [28] | CC-SA 1.0 |
| Baidu Baike | Encyclopedic/Chinese | A Chinese encyclopedia | &0000000001519920.0000001,519,920 [29] | Copyrighted |
| WikiZnanie | Encyclopedic/Russian | A Russian language encyclopedia released under the FreeBSD Documentation License | | |
| Enciclopedia Libre Universal en Español | Encyclopedic/Spanish | A Spanish language fork of Wikipedia | | GFDL |
| Vikidia | Encyclopedic/Spanish and French | A Spanish and French language encyclopedia for children ages 8–13 | | GFDL |
| Susning.nu | Encyclopedic/Swedish | A Swedish language encyclopedia, which competes with Swedish Wikipedia | >&0000000000063400.00000063,400 [30] | Copyrighted |
| Wikinews | General—News | Collaborative news service, a wikimedia project | | GFDL and other |
| GCPEDIA | Government | Internal Government of Canada Wiki | | |
| ZineWiki | Social—Independent media | A zine encyclopedia | | |
| WikiCandidate | Fictional presidential campaign | A virtual campaign for a fictional U.S. presidential candidate. A project of Cornell University. | | |
| Congresspedia | Government—United States Congress | A separately branded sub-section of SourceWatch | | GFDL |
| Diplopedia | Government—Diplomacy | Encyclopedia of the U.S. Department of State collecting items related to international relations and diplomacy | | |
| Jurispedia | Government—Law | A multi-lingual academic encyclopedia, including Arabic, Chinese, English, French, German and Spanish | | CC-NC |
| SourceWatch | Social—Propaganda | Formerly Disinfopedia, discusses propaganda and includes organizations that seek to influence public opinion | | GFDL |
| Wikileaks | Social—Whistleblowers | Allows people to leak documents anonymously | | - |
| Intellipedia | Government—Intelligence | Three non-accessible wikis running on networks that link the U.S. intelligence community | | |
| WikiTimeScale | General—Human history | An interactive timeline of history | | GFDL |
| OpenWetWare | Science—Biology | Promotes sharing and dissemination of knowledge related to biological research | | CC-SA |
| Wikispecies | Science—Biology | A directory of species; wikimedia project | | GFDL... |
| BOWiki | Science—Gene function | An ontology curation framework and gene function editor | | GFDL |
| SNPedia | Science—Biology | A database of research and information about single-nucleotide polymorphisms, including medical consequences for people who have DNA info about themselves | >&0000000000003500.0000003,500 [31] | CC-by-nc-sa 3.0 |
| Psychology wiki | Science—Psychology | Promotes sharing and dissemination of knowledge related to psychological research | | |
| Sensei's Library | Misc—Go (game) | | >&0000000000018200.00000018,200 | OPL |
| PlanetMath | Misc—Mathematics | Free wiki-style mathematical encyclopedia | | GFDL |
| ATWiki | Misc—Assistive technology | Also addresses disabilities related to assistive technology | | |
| ShopWiki | Misc—Products | A shopping wiki and product comparison search engine featuring buying guides and shopping resources | | |
| RitchieWiki | Reference—Construction Equipment | An equipment wiki geared for the construction industry. Includes equipment specifications. Also available in French and Spanish. | | |
| Foodista.com | Reference—Food and Cooking | A Creative Commons structured wiki about foods, recipes, and other culinary information. | | CC-BY |
| Appropedia | English | Sustainable development including Appropriate technology | 2900[32] | CC-BY-SA 3.0 |
| Ekopedia | Multilingual—Encyclopedic | Environmental sustainability. | | CC-SA 3.0 |
| Heroes Wiki | Fiction—Heroes | | | CC-NC-ND |
| Medpedia | Encyclopedic Medical/health | Requires real names; guided by medical expert input while allowing edits from the general public | | GFDL |
| Catawiki | Catalogues | Dutch language only. Collectors specific for comics, coins, stamps, trading cards, board games, model cars, model trains, bank notes, books, watches, disney memoriablia, clocks en other. | >&0000000000200000.000000200,000 | |
| Collegewikis | Information exchange among college students | | | |
| Uninotes.org | | | | |
| AboutUs.org | Internet directory | originally with MediaWiki software, but now largely with Ruby on Rails | >14,000,000 | GFDL and CC-BY-SA |
| SKYbrary | Aviation safety information | | | |
| Bulbapedia | Pokémon | Created by Bulbagarden.net, a Pokémon focused network | >15,000 | CC-BY-NC-SA 2.5 |
| StrategyWiki | Gaming - Walkthroughs | | >3,000 | CC-BY-NC-SA 2.5 |
