Wikipedia - Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.
DokuWiki - DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.
Encyclopædia Britannica - Explore the fact-checked online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of objective articles, biographies, videos, and images from experts.
Wiki.js - An open source, modern and powerful wiki app built on Node.js, Git, and Markdown.
Kiwix - Kiwix enables you to have the whole Wikipedia at hand wherever you go!
TiddlyWiki - a non-linear personal web notebook