All the world’s knowledge
Wikipedia is a free, collaborative encyclopedia written in 300 languages by volunteers around the world.
E-book textbooks and annotated texts
Wikibooks aims to build a collection of free e-book resources including textbooks, annotated texts, instructional guides, and manuals.
A dictionary for over 170 languages
Wiktionary is a free multilingual dictionary. The project aims to describe all words of all languages. It includes language resources such as a thesaurus, rhyme guide, and language statistics.
Find quotes across your favorite books, movies, authors and more
Wikiquote is an online collection of sourced quotations from notable people and creative works in over 75 languages. It also includes proverbs, mnemonics and slogans.
68 million images, photographs, videos and music files and counting
Wikimedia Commons is the world’s largest free-to-use library of illustrations, photos, drawings, videos, and music.
The free library
Wikisource is a library of freely-licensed source texts and historical documents, including poetry, government documents, constitutions of many countries, and general literature.
Access learning resources, projects and research at any level of study
Wikiversity is devoted to learning resources, learning projects, and research for use in all levels, types, and styles of education.
The free species directory
Wikispecies is a species database for taxonomy that covers living and fossil representatives of Animalia, Plantae, Fungi, Bacteria, Archaea, Protista and all other forms of life.
The database of structured information collaboratively edited
Wikidata acts as central storage of structured data for Wikimedia projects. Structuring data into a machine-readable format makes it easier to view, search, edit, curate, use and re-use files.
The library of code functions anyone can edit
Wikifunctions allows everyone to collaboratively create and maintain code functions that can be used to answer questions, such as how many days have passed between two dates, or the distance between two cities.
The software platform that makes Wikipedia possible
MediaWiki is free and open source wiki software that anyone can use and develop. It is the platform on which Wikimedia projects are built.
The ultimate travel guide
Wikivoyage aims to create the world’s largest free, complete and up-to-date worldwide travel guide.
The free news source
Wikinews provides a free content alternative to commercial news sites with articles that are fact-checked and peer reviewed.
Project coordination software tool for global collaboration
Meta-Wiki is a project used as a central hub for various coordination and organization tasks, such as discussions affecting multiple wikis or planning upcoming events.