The openbook filesystem is a fuse-based file synchronizer. Once the fuse filesystem is mounted file synchronization happens in the background. We're planning to use a Bayou-like peer-to-peer synchronization strategy, however at this point in time we're developing the system to use a dedicated server.
Joshua Bialkowski Gabe Ayers Bruno Alvisio
You can find doxygen documentation here. The doxygen mainpage has build instructions for Ubuntu 12.04 (though they are quite generic).