FEATool Multiphysics is an easy-to-use FEA and CFD Simulation Toolbox
CFDTool - Easy to Use Computational Fluid Dynamics (CFD) Toolbox
Class library for computational cybernetics
Matlab/Scilab-FEMM based GUI to Assist the Design of Permanent Magnet
The DREAM toolbox is a free open source acoustic field simulation tool
An automated controller testing tool