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OpenStax | Free Textbooks Online with No Catch
(openstax.org)
This community is dedicated to educational resources for the modern autodidact, as well as discussion on self-teaching methods. Preferably, resources are of at least university quality, though they do not have to be university affiliated.
Building a Study Plan
Matrix Chat
!opencourselectures@slrpnk.net
This is an initiative that has been active in producing peer-review open textbooks since 2012.