H2O

"H2O offers a platform for making and sharing open-licensed casebooks and other course materials online. It was created originally by the Berkman Klein Center for Internet and Society. It's developed and maintained toeday by the Library Innovation Lab at the Harvard Law School Library.... H2O allows professors to freely develop, remix, and share online textbooks under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License (per the Terms of Service). H2O is based on the open-source model: instead of locking down materials in formalized textbooks, we believe that course books can be free (as in “free speech”) for everyone to access and, just as important, build upon. Currently, H2O is geared primarily toward law professors, though the platform can be used across intellectual domains."