Download of CalculiX 2.3.001 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. This free software is an intellectual property of Charly Piva.
We cannot guarantee that the program is safe to download as it will be downloaded from the developer's website. Before launching the program, check it with any free antivirus software. The program lies within Photo & Graphics Tools, more precisely Viewers & Editors. The most popular versions of the program are 2.3, 2.1 and 2.0.
From the developer:
CalculiX is a package designed to solve field problems. The method used is the finite element method.
With CalculiX Finite Element Models can be build, calculated and post-processed. The pre- and post-processor is an interactive 3D-tool using the openGL API. The solver is able to do linear and non-linear calculations. Static, dynamic and thermal solutions are available. Both programs can be used independently.
You may want to check out more software, such as Montagne, ImageVisu or AbsoluteDeNoiserFree, which might be similar to CalculiX.