Twilight Render is described as ', one of the photorealistic 3D rendering systems for SketchUp,'. There are more than 25 alternatives to Twilight Render for a variety of platforms, including Windows, Mac, Linux, Sketchup and Autodesk 3ds Max. The best alternative is Adobe Dimension. It's not free, so if you're looking for a free alternative, you could try LuxCoreRender or POV-Ray. Other great apps like Twilight Render are appleseed (Free, Open Source), RenderMan (Free Personal), Mitsuba (Free) and Kerkythea (Free).
fryrender is the physically-based light simulator developed by RandomControl. It is a photo-realistic render engine where all the elements involved in the generation of the final image (materials, lights and cameras) are based on physically accurate models.
Arion is the hybrid-accelerated and physically-based light simulator developed by RandomControl. It inherits all our expertise in light simulation and makes it run on steroids, thanks to our very unique approach to massive CPU+GPU+LAN computation.
mental ray® is a rendering software which generates images of outstanding quality and unsurpassed realism. The software combines the physically correct simulation of the behavior of light with full programmability for the creation of any imaginable visual effect.
LightUp allows placing light sources (including IES) inside your SketchUp model and navigating the lit results in realtime. You can add reflections, panoramas, skybox and generate high resolution Movies and Still images all from inside the SketchUp window.