Creative Commons has announced that Flexbooks is now in beta. OEN reported a little over a wekk ago the release of a physics book through Flexbooks. Flexbooks is sponsored by CK-12 Foundation, a non-profit organization. The textbooks are licensed CC-BY. From the “About” page on CK-12:
Using a collaborative and web-based compilation model that can manifest open resource content as an adaptive textbook, termed the “FlexBook”, CK-12 intends to pioneer the generation and distribution of high quality, locally and temporally relevant, educational web texts. The content generated by CK-12 and the CK-12 community will serve both as source material for a student’s learning and provide an adaptive environment that scaffolds the learner’s journey as he or she masters a standards-based body of knowledge, while allowing for passion-based learning.

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