PowerDEVS [BK011] is a general purpose software tool for DEVS modeling and simulation oriented to the simulation of hybrid systems. The environment allows defining atomic DEVS models in C++ language that can be then graphically coupled in hierarchical block diagrams to create more complex systems. It is developed at Universidad Nacional de Rosario (Argentina) by Ernesto Kofman, Federico Bergero, Gustavo Migoni, Enrique Hansen, Joaquín Fernandez, Marcelo Lapadula and Esteban Pagliero. The distribution is totally free.