I notice that there have been enquiries on this list regarding the status of Open Book (a fork of Koha that was being developed and then seemed to disappear). It appears that development and testing has been continuing and the name is now the Integrated Library System (ILS) and sponsored by LearningAccess.org. They have a bit on info on their website at http://www.learningaccess.org/website/techdev/ils.php but no downloads available yet.