Wikipedia - Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.
Udemy - Online Courses - Learn Anything, On Your Schedule
Miraheze - Miraheze is a wiki farm (hosts wikis) for free and with no ads, it also provides custom domains...
Adobe Captivate Prime LMS - Adobe Captivate Prime LMS is easy to setup and helps in delivering engaging learning experiences in a personalized manner across devices.
Kiwix - Kiwix enables you to have the whole Wikipedia at hand wherever you go!
Moodle - Moodle is the world's most popular learning management system. Start creating your online learning site in minutes!