The textbook Open Source Technology is written in a simple and easy language. It comprises five chapters i. e. , Chapter 1. Introduction to Open Source, Chapter 2. Principles and Open Source Methodology, Chapter 3. Case Studies, Chapter 4. Open Source Project and Chapter 5. Open Source Ethics. This textbook is intended for those who are interested in Open Source Technology. It has been designed to meet the needs of beginners as well as advanced learners who wish to deal with Open Source Technology. Salient features of the book are: The book is a little futuristic. Each chapter starts with its objectives. The students know what is expected of them after they go through the chapter. Conversational and easy to understand language has been used. Diagrams and illustrations are self explanatory. The summary given at the end of each chapter helps in reviewing the whole chapter in a short time. It provides deep knowledge of Open Source Technology. This book can be used by the students of Computer Science and IT, Business Administration and Management.