Nowadays libraries adopting open source software and Library management system is one of them. Today there are many options of open source library management systems and for selecting suitable system there is need for details evaluation. This book gives detail account of presently available open source library management systems. Suggests details criteria for evaluation of open source library management systems and gives detail account of evaluation of some major open source library management systems. This book will be useful for librarians, library policy makers and LIS student.