ANYstructure is a free and open source software for structural engineers and naval architects
The software is intended for dimesioning and strength calculations of plate fields and cylinders
Calculations is based on DNV standards and recommended practices
The code can be found on GitHub:
https://github.com/audunarn/ANYstructure
Python: PIP install ANYstructure
Windows installer, download here:
https://github.com/audunarn/ANYstructure/releases