If you would like to participate in its development, please join the developers mailing list and use the Trac to create tickets and monitor the project development. There is also a Google+ page that you can add to your circles and have release notifications show up in your stream.
For an overview of the current project activity, there is a Trello board, feel free to become a member and share what you are doing with the rest of the BFR community.
This tutorial is a step-by-step walk through of the library describing the essential components of a BFR application and how the pieces fit together.
The library has a variety of sample applications, some of them are a framework for building larger applications.
This documentation is intended for BFR developers.