Calculix is a free and open-source finite-element analysis application that uses an input format similar to Abaqus. It has an implicit and explicit solver written by Guido Dhondt and a pre- and post-processor written by Klaus Wittig. The original software was written for the Linux operating system. Convergent Mechanical has ported the application to the Windows operating system. More at Wikipedia https://en.wikipedia.org/wiki/Calculix
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