This work presents a multi-platform three-dimensional computational electromagnetic environment called SSAR-BR. It was developed using free software and applied to design devices and analyze non-ionizing radiation effects in humans. The SSAR-BR integrates a CAD interface and pos-processing module developed in Java and the processing is performed by numerical methods in C++ (FDTD 3D) and Fortran (FEM 3D). This entire solution provides a sophisticated computational environment based on Software Engineering principles, which contributes with computational performance and components reuse. The evaluations tests were focused in the numerical accuracy and the human-machine interactions, providing successful results in both cases. ©2009IEEE.