What are some alternatives?
When comparing Clara.io and Sunflow Rendering System, you can also consider the following products
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
RenderMan - Advanced Technology from Pixar Animation Studios for Rendering VFX and Animation
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.
appleseed - appleseed is an open source, physically-based global illumination rendering engine primarily designed for animation and visual effects.
Keyshot - KeyShot 3D rendering and animation software is the fastest, easiest way to create amazing, photographic visuals of your 3D models. Enter your search in the box aboveTryYour download of KeyShot is only moments away.
MODO - Modo by Foundry brings you the next generation of 3D modeling, texturing and rendering tools in a powerful integrated software package.