Calculix's a free and open source finite element analysis application that uses a similar input format to ABAQUS. It's an implicit and explicit solver (CCX) written by Guido Dhondt and a pre and post processor (CGX) written by Klaus Wittig. The original software was written for the Linux operating system. Convergent Mechanical Solutions has ported the application to the Windows operating system. The pre processor component of Calculix can generate grid data for the Computational Fluid Dynamics… (More on Calculix)