Wikipedia - Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.

Alcamy - Free, open self-learning platform. Learn & teach anything.

Kiwix - Kiwix enables you to have the whole Wikipedia at hand wherever you go!

EduDo - EduDo is a video discussion platform

Encyclopædia Britannica - Explore the fact-checked online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of objective articles, biographies, videos, and images from experts.

Lrnkey - Lrnkey.com is a global online marketplace that easily connects you to live instructors and tutors across the planet.