Sahana [http://sahana.lk/] is a Free and Open Source Disaster Management System. It was built in the aftermath of the Tsunami in December 2004, and has evolved into a fully fledged generic disaster management system. The system aims to be a comprehensive solution for information management in relief operations, recovery and rehabilitation. It is a web based collaboration tool that addresses the common coordination problems during a disaster from finding missing people, managing aid, managing volunteers, tracking camps effectively between Government groups, the civil society (NGOs) and the victims themselves. Sahana achieves these by providing specific modules to handle various aspects during the aftermath of disasters. Winner of many notable awards and recognition, Sahana has been deployed and used to manage disasters in many countries, including Indonesia, Pakistan and the Philippines. This session gives an overview of Sahana and describes the reasons behind the success of Sahana, especially the FOSS influence. It also looks at the practical applications/deployments of Sahana, as well as its relationship to healthcare. - Ravindra DeSilva - Sri Lanka