Scilab is free open source software for numerical computation providing a powerful computing environment for engineering and scientific applications. Scilab includes hundreds of mathematical functions. It has a high level programming language allowing access to advanced data structures, 2-D and 3-D graphical functions. A large number of functionalities is included in Scilab: control, simulation, optimization, signal processing. Xcos, the hybrid dynamic systems modeler and simulator is provided with the platform. Scilab is free software distributed under CeCILL license (GPL compatible).