Sites and apps similar to 3DOptix include Zemax OpticStudio. It's paid, but FRED is free. Other options are LightTools, CODE V Optical Design Software and Optic Sketch. In total there are five sites and apps like 3DOptix for Windows and self-hosting.
OpticStudio is the pinnacle of optical and illumination design software, an evolution engineered by Zemax. The intuitive user interface combined with a comprehensive array of features and unmatched functionality make OpticStudio the preferred design platform for engineers...
LightTools is a 3D optical engineering and design software product that supports virtual prototyping, simulation, optimization, and photorealistic renderings of illumination applications. Its unique design and analysis capabilities, combined with ease of use, support for rapid...
Design, optimize, and fabricate reliable imaging optics with the most powerful ray tracing and optical design software available
United States
Optic Sketch is an easy-to-use and affordable 3D optical simulation tool that can help you assess component performance, and quickly layout and simulate optical systems.
United Kingdom
The Free Registry for ENUM and Domains (a.k.a. FRED) is open-source software for running domain and ENUM Registry, developed by the CZ.NIC, the .CZ and 0.2.4.e164.arpa domain Registry.
Czechia
EU