Ansys is a provider for design and simulations. Currently we have two products:
https://www.zemax.com/
https://www.ansys.com/products/optics-vr/ansys-speos
You can have free trial license for a month.
For choosing and buying materials and lenses/mirrors from different brands, you can refer to Photonics Spectra, which has ads and annual product catalog you can order, free of charge if qualified. There are also many manufacturers you may find online.
I wish all the best for your project!
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