In this chapter, we've covered the eight Wikimedia projects besides Wikipedia that aim to produce free-content, wiki-based reference materials: Wiktionary, Wikinews, Wikibooks, Wikiquote, Wikisource, Wikispecies, Wikiversity, and the Wikimedia Commons. These projects offer complementary content, and you can link pages between the different projects, providing a comprehensive reference resource about a topic.
This survey of the sister projects run by Wikimedia sets the scene for our last chapter. With so much diverse activity enabled by so many editable sites, the projects need a central supporting structure, which is provided by the Wikimedia Foundation.