Ceph

From http://ceph.com/docs/master/install/debian/ :

Add our package repository to your system’s list of APT sources, but replace {BRANCH} with the branch you’d like to use (e.g., chef-3, wip-hack, master, stable). See the gitbuilder page for a complete list of distributions we build.

The gitbuilder link shows http://gitbuilder.ceph.com which does not present a list of branches. Instead an example of a list of branches is here: http://gitbuilder.ceph.com/ceph-deb-precise-x86_64-basic/ref/