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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.
WikiExplorer - Download WikiExplorer for free. WikiExplorer is similar to the windowsExplorer. The filesystem is visualized within.
Citizendium - A wiki for providing free knowledge where authors use their real, verified names.
Wapedia - Education & Reference
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.
Oppia - Oppia is a free, open-source learning platform.