H20 is a web-based platform for creating, editing, organizing, consuming, and sharing open course materials. Currently geared toward law professors (but available for use across domains), it makes course books free (as in “free speech”) for everyone to access and build upon. Benefits of H2O include the ability to tailor casebooks from scratch or by adapting existing casebooks and syllabi, replacement of heavy and expensive casebooks, full alignment of class needs with course materials, and ability to print sections or the entire casebook on demand.