Source code of Hybrid Bookshelf and Library Data Unifier available at Github
The sources of the Hybrid Bookshelf are now online at Github (LGPL 3). I haven’t had the time for a deeper analysis, but it seems that a lot of its features (coloring of the books, sharing items via email etc.) are only available as a commercial version and not released as open source software. The out-of-the-box demo connects to the Library Data Unifier, which is also at Github available (GPL 2).