I use Wikipedia every day and learn so much from it, and I've never had to pay a penny. Thank you, Wikipedia!

A free, collaborative, multilingual Internet encyclopedia.

The mission of the Wikimedia Foundation is to empower and engage people around the world to collect and develop educational content under a free license or in the public domain, and to disseminate it effectively and globally.  In collaboration with a network of chapters, the Foundation provides the essential infrastructure and an organizational framework for the support and development of multilingual wiki projects and other endeavors which serve this mission. The Foundation will make and keep useful information from its projects available on the Internet free of charge, in perpetuity.

Wikimedia Foundation

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Co-founder & Head of Product @ Every.org. Especially excited by small nonprofits doing big things for underprivileged people and our planet.