Apps similar to Zemax OpticStudio include LightTools. It's paid, but Geopter is free. Other options are QUADOA , Oslo, Optic Sketch and 3DOptix. In total there are nine apps like Zemax OpticStudio for Windows, Linux and the web.
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...
Quadoa is the first sequential and multi-sequential optical design software for the complete prototyping process of optical systems. With the main focus on optical simulation, analysis and optimization, it features a wide range of comprehensive optical design capabilities.
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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.
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3DOptix is changing the optical design process and revolutionizing the "optical system" simulation by harnessing the GPU cloud power with embedded 3D and CAD capabilities.
OpTaliX is a comprehensive program for computer aided design of optical systems, thin film multilayer coatings and illumination systems. OpTaliX provides powerful features to conceptualize, design, optimize, analyze, tolerance and document virtually any optical system.
Design, optimize, and fabricate reliable imaging optics with the most powerful ray tracing and optical design software available
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