Skip to main contentSkip to site search FreeCAD is a general purpose parametric 3D CAD modeler. The development is completely Open Source (LGPL License). Elmer is an open source multiphysical simulation software mainly developed by CSC - IT Center for Science (CSC). Gmsh is a 3D finite element grid generator with a build-in CAD engine and post-processor. FEATool Multiphysics is a fully integrated Finite Element FEM CAE simulation toolbox for Matlab. With FEATool you can easily model and simulate heat transfer, fluid flow CFD, structural mechanics, chemical reactions, general PDEs, and more. CFD - Laminar or turbulent fluid dynamics models can be selected depending on the fluid flow Reynolds number. Both steady-state and transient solvers are available.