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MediaWiki is a free and open-source wiki engine. It was developed for use on Wikipedia in 2002, and given the name “MediaWiki” in 2003. It remains in use on Wikipedia and almost all other Wikimedia websites, including Wiktionary, Wikimedia Commons and Wikidata; these sites continue to define a large part of the requirement set for MediaWiki. MediaWiki was originally developed by Magnus Manske and improved by Lee Daniel Crocker. Its development has since then been coordinated by the Wikimedia Foundation.
The software behind Wikipedia and other Wikiprojects. Trade-free as well, because it doesn’t ask for anything.