Good Morning Friends!!! With due respect, I render homage to the unforgettable legend Padmashri Dr. S. R. Ranganathan who paved the way for Library Professionals by his enormous contribution to Library Profession. I wish you all a very happy ‘National Librarian’s Day’ and on this occasion I take this opportunity to introduce *‘An online manual of open source tools’* which can be accessed at www.dptripathi.in/manual This e-manual has been prepared based on personal experience, self-practice and browsing different resources which includes the following. *Koha* - Open Source Integrated Library Management System (ILMS) *DSpace* - Open Source Digital Repository Software *Joomla* - Open Source Content Management System for web designing *Data Migration* - How to migrate from one system to another system By reading the content available on this, anyone will be able to understand the basic procedure about how to work in any good library. The content is purely related to working procedure of any academic library. The procedure of every module of every software and also about software handling is given in detail. Each menu further contains sub-menu inside the page which further contains information. This e-manual will enable you to learn the basic functions about library management, establish digital repository and also design & development of web applications. The unique part of this e-manual is Data Migration. Hope the content will be beneficial for your purpose. Some of the portions are left to be filled by content which will be taken care soon. I welcome your honest feedback and suggestions for further improvements. Thanks! ! *D. P. Tripathi* *NIT Rourkela* -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.