Wikipedia : Encyclopedia containing more than 7 million articles in 250 languages.
Wiktionary : Dictionary cataloging meanings, synonyms, etymologies and translations
Wikibooks : Collection of free educational textbooks and learning materials.
Wikiquote : Collection of quotations structured in numerous ways.
Wikisource : Project to provide and translate free source documents, such as public domain texts.
Wikimedia Commons : Repository of images, sounds, videos and general media, containing more than 1,000,000 files.
Wikimedia Incubator : Used to test possible new Wikimedia projects and new languages for existing projects.
Wikispecies : Directory of species data on animalia, plantae, fungi, bacteria, archaea, protista and all other forms of life.
Wikinews : News source containing original reporting by citizen journalists from many countries.
Wikiversity : Courses, course materials, tests. Announced to go into beta testing, little has been officially decided on its structure.
Wikimedia project coordination (launched November 2001).