Open-Source Softwares have emerged as a cross-disciplinary paradigm for a large spectrum of computing applications. It helps in many ways, keeping the software market away from monopolies and providing innovative solutions. It not only helps the organizations to keep a control on the cost of development and deployment but also kept them ahead in terms of technology and robustness. OSS has also changed the way software applications are architected, deployed, and consumed but also they are engineered to provide large distributed cross-platforms and frameworks. Open-Source Software has now established as a cross-disciplinary paradigm for distributed enterprise computing and e-Government. It is helping organizations both Governmental and non-Governmental to keep a control on the cost of development and deployment. OSSs have not only changed the way software applications are architected, deployed, and consumed but also they are engineered to provide large distributed cross-platforms and frameworks. IEEE Computer Society Lahore Section in technical collaboration with KICS UET Lahore, is organizing a three-day conference to invite researchers and practitioners from across the world to share their ideas and experiences related to the state-of-the-art and the future of open-source software like virtualization, knowledge-bases, surveillance, automation, etc. ICOSST-2015 will create a scientific venue where participants can share ideas, strategies, and policies for tackling the development, research and adaptation challenges related to open-source tools and open-source development environments for the customized and enterprise grade applications.