Keyshot is not available for Linux but there are plenty of alternatives that runs on Linux with similar functionality. The best Linux alternative is LuxCoreRender, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Keyshot and many of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to Keyshot are appleseed (Free, Open Source), V-Ray (Paid), RenderMan (Free Personal) and Mitsuba (Free).
Thea Render is a state-of-the-art biased/unbiased renderer with a rich set of innovative features, a powerful material system and its own advanced studio, all-in-one. Plugins are available for 3dsMax, Blender, Cinema4D, Rhino, SketchUp and SoftImage.
YafaRay is a free open-source montecarlo raytracing engine released under the LGPL 2.1 license. Raytracing is a rendering technique for generating realistic images by tracing the path of light through a 3D scene.
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.
MiniLight is a minimal global illumination renderer. It is primarily an exercise in simplicity. But that makes it a good base and benchmark (in some sense) for development and experimentation. And it just might be the neatest renderer around (on average, about 650 lines).
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.
OctaneBench® allows you to benchmark your GPU using OctaneRender. This provides a level playing field by making sure that everybody uses the same version and the same scenes and settings. Without these constraints, benchmark results can vary a lot.