Uncyclopedia is several forks of satirical online encyclopedias that parody Wikipedia. Its logo, a hollow "puzzle potato", parodies Wikipedia's globe puzzle logo, and it styles itself as "the content-free encyclopedia", parodying Wikipedia's slogan of "the free encyclopedia" and likely as a play the fact that Wikipedia is described as a “free-content” encyclopedia. Founded in 2005 as an English-language wiki, the project spans more than 75 languages as well as several subprojects parodying other wikis. Uncyclopedia's name is a portmanteau of the prefix un- and the word encyclopedia.

Fandom is a wiki hosting service that hosts wikis mainly on entertainment topics. The privately held, for-profit Delaware company was founded in October 2004 by Wikipedia co-founder Jimmy Wales and Angela Beesley. Fandom was acquired in 2018 by TPG Inc. and Jon Miller through Integrated Media Co.