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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.
Kiwix - Kiwix enables you to have the whole Wikipedia at hand wherever you go!
Wiki.js - An open source, modern and powerful wiki app built on Node.js, Git, and Markdown.
Oppia - Oppia is a free, open-source learning platform.
TiddlyWiki - a non-linear personal web notebook