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MediaWiki - MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia.
Wikipedia - Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.
TiddlyWiki - a non-linear personal web notebook
WikiSpooks.com - WikiSpooks is a global alternative encyclopedia on politics, spy craft, deep state intelligence, and conspiracies, free of corporate influence, partisan politics, or government propaganda for historians and truth-seekers to read, edit, and share.
Confluence - Confluence is content collaboration software that changes how modern teams work
Oppia - Oppia is a free, open-source learning platform.