On January 15, 2001, Wikipedia was launched by Jimmy Wales and Larry Sanger, quickly establishing itself as the foremost and most popular wiki site. It was conceived as an open-source encyclopedia, freely editable by anyone. This collaborative ethos propelled Wikipedia's expansion, resulting in articles across over 300 languages.

Wikipedia covers many topics, ranging from history, science, and mathematics to popular culture, entertainment, and current affairs. To earn dedicated articles, cases generally need to meet specific criteria. Articles on Wikipedia maintain a neutral, encyclopedic tone and are required to be verifiable by reliable sources.

Citations and references to reputable sources constitute the bedrock of Wikipedia articles. Editors are strongly encouraged to cite sources to underpin the information they contribute. Administrators and experienced editors play critical roles in maintaining the quality and integrity of Wikipedia articles.

Wikipedia wields a profound influence in disseminating knowledge and enhancing accessibility. It has evolved into an invaluable resource utilized by researchers, students, journalists, and the general populace. The Wikimedia Foundation, a nonprofit entity, supports and hosts Wikipedia and other Wikimedia initiatives. Beyond Wikipedia, the foundation fosters additional projects such as Wikibooks, Wikinews, Wiktionary, and others, each dedicated to distinct content domains.

Official website: https://en.wikipedia.org/

Fandom, previously known as Wikia, is an online platform created in 2004 to foster fan communities and fan-generated content related to various media and entertainment forms. Founded by Jimmy Wales and Angela Beesley Starling, Fandom provides a space where fans can create, share, and discuss content linked to their beloved movies, TV shows, video games, books, and more.

At the heart of Fandom are fan wikis, which serve as dedicated spaces for enthusiasts to collaboratively contribute articles, information, trivia, and discussions about their favorite media. These fan wikis span many pop culture topics, including movies, TV series, video games, comics, literature, anime, and beyond. They often feature comprehensive articles about characters, plot summaries, episode guides, gameplay tips, and fan theories, offering fans a rich and immersive experience.

Fandom thrives on collaborative editing, much like other wiki platforms. Fans, who are often passionate and deeply knowledgeable about their chosen subjects, can create new pages, enhance existing content, and enrich articles with images. The platform also fosters community and discussion, offering features like forums, chat rooms, and comment sections, enabling users to interact, ask questions, and share their insights.

Fandom collaborates with entertainment companies to establish and maintain official wikis for popular franchises, ensuring that fans can access accurate and up-to-date information. With a global presence and a mobile app for on-the-go access, Fandom is a vibrant hub for fan-driven content, enhancing the overall experience for enthusiasts worldwide and celebrating their shared passions.

Official website: https://www.fandom.com/

Founded in 2005 by Jack Herrick and Josh Hannah, WikiHow is a wiki-style website that provides accessible and practical instructions across various subjects. It revolves around a wealth of content, including DIY projects, culinary arts, home improvement, personal development, technology, and health. WikiHow articles typically unfold as actionable steps, often complemented by user-friendly guidance images.

WikiHow has a global community of registered users who actively contribute their expertise and experiences, enriching and refining how-to guides. Quality assurance stands as a central pillar within the WikiHow ecosystem. The administrators and experienced editors diligently oversee contributions, ensuring the precision and excellence of articles.

Over time, WikiHow has evolved into a pivotal educational resource, serving the needs of students and educators alike. Moreover, it is a pragmatic problem-solving hub for individuals seeking resolutions to everyday challenges and endeavors to master new skills. WikiHow provides a mobile app for users' convenience, facilitating easy access to how-to guides from mobile devices.

Although WikiHow is owned by a for-profit company, it adopts a hybrid approach, striving to harmonize its commercial endeavors with its fundamental mission of delivering freely accessible and valuable content. This sustainability model chiefly relies on advertising revenue while steadfastly upholding its unwavering commitment to nonprofit educational objectives.

Official website: https://www.wikihow.com/Main-Page

Baseball Reference is a comprehensive online database and reference hub that caters to baseball enthusiasts and researchers alike. It is a treasure trove of statistical and historical information, primarily focused on Major League Baseball (MLB). At the heart of Baseball Reference are its extensive statistics, covering player performances, team records, and league-wide trends.

One of Baseball Reference's standout features is its commitment to preserving the rich history of baseball. It provides access to historical data dating back to the early days of professional baseball, making it an invaluable tool for historians, researchers, and fans interested in the game's evolution. Detailed player and team profiles offer insights into the careers of MLB legends, featuring biographical information, career achievements, and transaction histories.

Beyond individual player statistics, Baseball Reference compiles information on awards and honors in MLB, from MVP and Cy Young Awards to Hall of Fame inductions. Additionally, Baseball Reference provides news updates, articles, and analyses to keep users informed about current MLB events and historical trends.

The website is a community of baseball enthusiasts, offering forums for discussions, data corrections, and user contributions to enhance the accuracy of information. Whether used for recreational enjoyment by baseball fans, Baseball Reference has solidified its status as a premier destination for exploring Major League Baseball history.

Official website: https://www.baseball-reference.com/

Wikimedia Commons started in September 2004 as a part of the Wikimedia Foundation's projects. It's like an extensive online library for various media, like pictures, videos, and audio. The main idea is to have a central place where people can keep, share, and use these media files for free.

One unique thing about Wikimedia Commons is its open licenses, especially the Creative Commons Attribution-ShareAlike (CC BY-SA) license. This means anyone can use, change, and share the media files if they credit the source and share any new work they make similarly. It's all about encouraging creativity, learning, and sharing knowledge.

The library has many media, including photos, drawings, animations, and sounds. You can find all kinds of stuff, from old historical pictures and scientific graphics to modern art and audio clips. People worldwide work together to add and organize these media files, ensuring they're good quality and easy to find.

Wikimedia Commons isn't just a library; it's also connected to other Wikimedia projects like Wikipedia. This makes it easier for people to find pictures and videos to use in Wikipedia articles. It's useful for students, teachers, researchers, and artists who need media for their work. And it's funded by donations to keep everything accessible and open for everyone to use.

Official website: https://commons.wikimedia.org/wiki/Main_Page

Wiktionary, a project under the umbrella of the Wikimedia Foundation, was initiated in December 2002 as a collaborative and open-content online dictionary. It was designed as a sister project to Wikipedia, with the primary objective of creating a comprehensive lexical database encompassing many languages, words, and meanings. Wiktionary operates on the principles of open content, permitting unrestricted access, editing, and contributions from users worldwide.

Wiktionary provides definitions, translations, and linguistic insights in multiple languages. Entries within Wiktionary include definitions, pronunciations, etymologies, translations, and information regarding word usage and grammatical characteristics. Users can also find examples, synonyms, antonyms, related terms, and links to external sources within entries.

Both registered users and anonymous contributors play essential roles in adding, editing, and refining definitions and linguistic information. The Wiktionary community collaborates diligently to uphold the quality and accuracy of entries, abiding by guidelines and policies that ensure consistency and reliability.

Wiktionary is a valuable resource for language learners, linguists, writers, and anyone needing word definitions and translations. It is often used with other language references for research, translation, and language study. The project aims to cover a vast array of languages, from major global languages to regional and less widely spoken ones, making it an indispensable tool for exploring the richness of human language. As a living project, Wiktionary continually expands its language coverage and content through the dedicated efforts of its contributors.

Official website: https://en.wiktionary.org/wiki/Wiktionary:Main_Page

Wikitravel, a collaborative travel guide and wiki-based website, is a valuable resource for global destinations. It was founded in 2003 by Evan Prodromou and Michele Ann Jenkins to create an open, web-based travel guide. This platform empowers travelers to access real-time, user-generated information on destinations, attractions, accommodations, and more.

Like Wikipedia, Wikitravel fosters a culture of collaborative editing, encouraging travelers to contribute their experiences, recommendations, and insights about specific places. Its coverage extends comprehensively, encompassing cities, regions, countries, and notable landmarks. Within its articles, you can find a plethora of information, ranging from local cultures and transportation options to lodging suggestions, dining experiences, activity recommendations, and practical travel tips.

The Wikitravel community comprises passionate travelers and contributors who abide by guidelines and principles akin to Wikipedia's ethos. In the early 2000s, a significant milestone occurred when Internet Brands acquired Wikitravel. In 2012, a group of editors and administrators from Wikitravel embarked on a new journey by initiating a project named Wikivoyage, a dedicated travel wiki committed to providing free information.

While Wikitravel continued its independent operation, some contributors and users transitioned to platforms such as Wikivoyage and other travel-related resources. Nevertheless, Wikitravel's enduring legacy rests upon its pioneering efforts to establish a collaborative hub for exchanging travel-related information and insights.

Official website: https://wikitravel.org/en/Main_Page

Started in July 2003, Wikibooks, part of the Wikimedia Foundation, is one of the most popular Wiki sites to gather lots of free textbooks and educational stuff. Wikibooks gives people easy access to free materials, like textbooks and lessons, on many subjects. They follow open content rules, which means anyone can read, edit, and share their materials. Most of what they have is under the Creative Commons Attribution-ShareAlike (CC BY-SA) license.

Inside Wikibooks, users find many subjects to learn about, like math, science, history, stories, programming, and more. Each WikiBook is split into parts or sections, so finding what users seek is simple. Wikibooks works a bit like Wikipedia. Whether they have an account or not, people worldwide can work together to make educational content. This teamwork keeps the materials growing and getting better.

Wikibooks aren't just in one language. They have versions in many languages so that more people can use them. They also make sure everything is accurate and follows their rules. They have volunteers who check and make sure the content is good, just like other Wikimedia projects. Wikibooks connects with other Wikimedia projects like Wikipedia, which makes it easy to find more information on the same topic.

Users can read everything for free online and even download, print, or save the textbooks as PDFs to use offline. Many educators, students, and self-learners find Wikibooks helpful for learning. And it keeps growing because many people work together to add more textbooks and educational stuff.

Official website: https://en.wikibooks.org/wiki/Main_Page

Created in September 2004 by the Wikimedia Foundation, Wikispecies stands as a remarkable online project with the singular focus of cataloging and documenting all species of life on our planet. This collaborative initiative shares its roots with Wikimedia's more widely recognized projects like Wikipedia, but it distinguishes itself by concentrating on biological taxonomy and classification.

Wikispecies categorizes species according to established biological taxonomy principles. It provides a wealth of information about each species, encompassing scientific names, classifications, synonyms, and references to scientific literature. It has become a reference tool for researchers, scientists, educators, and anyone intrigued by the diversity of life on Earth.

A global community of registered users and contributors works together to add, edit, and augment species information, ensuring its accuracy and completeness. The multilingual approach of Wikispecies fosters a diverse range of contributors who can contribute species data in their preferred languages, breaking down language barriers and making this valuable resource accessible to a worldwide audience.

Wikispecies not only serve as a scientific reference but also as an educational tool. It offers opportunities for students, educators, and the curious to explore and learn about the intricacies of biodiversity and taxonomy. With expansion with other Wikimedia projects, such as Wikipedia and Wikimedia Commons, Wikispecies is integral in documenting, understanding, and appreciating the wondrous tapestry of life surrounding us.

Official website: https://species.wikimedia.org/wiki/Main_Page

DokuWiki is a user-friendly and lightweight open-source software designed to simplify creating and managing documentation, knowledge bases, and collaborative websites. It can run on various web servers with minimal server requirements, making it a practical choice for organizations and individuals seeking simplicity and efficiency.

DokuWiki has a straightforward markup language that allows users to create and format content using simple text-based commands. This simplicity makes it accessible to users with varying levels of technical expertise. The software also employs a namespace and page structure, helping users logically categorize and structure their content.

DokuWiki offers built-in version control, enabling users to track page changes over time. This feature is invaluable for collaborative projects and maintaining a history of edits and revisions. Access control lists (ACLs) allow administrators to manage permissions for viewing, editing, and creating content, offering flexibility in controlling access levels for different user groups.

DokuWiki supports a wide range of plugins and extensions that can enhance its functionality. Users can add features such as syntax highlighting, integration with other tools, and advanced formatting options through these plugins. With a supportive community, multilingual capabilities, and a commitment to open-source principles, DokuWiki has become a popular choice for creating and maintaining wikis across various domains.

Official website: https://www.dokuwiki.org/dokuwiki