Shaderlight is described as 'As an interactive, photorealistic renderer, Shaderlight redefines traditional rendering workflows. Simple to learn and easy to use, it features ‘progressive’ rendering that lets you see your image develop as you work so you can visualize your ideas in no time' and is an app. There are more than 25 alternatives to Shaderlight for a variety of platforms, including Windows, Mac, Linux, Autodesk 3ds Max and Sketchup apps. The best Shaderlight alternative is LuxCoreRender, which is both free and Open Source. Other great apps like Shaderlight are MoonRay, Adobe Dimension, POV-Ray and RenderMan.