WIKIPEDIA
The Free Encyclopedia
Wikipedia's sister projects
Commons
Freely usable photos & more
Wiktionary
Free dictionary
Wikibooks
Free textbooks
Wikinews
Free news source
Wikidata
Free knowledge base
Wikiversity
Free course materials
Wikiquote
Free quote compendium
MediaWiki
Free & open wiki software
Wikisource
Free library
Wikispecies
Free species directory
Wikivoyage
Free travel guide
Meta-Wiki
Community coordination