Public health is a promising field for development of Open Source (OS) solutions, mainly in developing countries, where there is a great demand for access to public information and computational resources in a safe, pervasive, and transparent way. Development of OS solutions focused on public health for developing (and non-English speaking) countries is incipient, despite of the intensive advance that could be achieved for the area. In Brazil, Medicine Assisted by Scientific Computing Network is playing a protagonist role by supporting development of OS projects in public health. Three projects are under development: (1) e-PID (Public Information and Development in Epidemiology) is an OS and Open Access e-learning environment aimed to Health Education Target Pentagon: students, professionals, managers, users and teachers; (2) EpiSSS (Epidemiologic Surveillance Support System) e PHISS (Pre-Hospital Information Support System) projects are aimed to provide decision support to management of acute events with low coverage of specialists such as epidemics, endemics and pre-hospital care; (3) Epidemics and Rescue! projects are games whose objective is simulate situations required for the training of public health and pre-hospital professionals, but difficult to be replicated in reality (like bioterrorist attack or a natural catastrophe). The use of OS for development of these projects not only makes them feasible to developing countries, but in addition can make solution of some technical obstacles, health informatics specific, easier. - Luciana Tricai Cavalini - Brazil