What are some alternatives?
When comparing Indigo Renderer and RenderMan, you can also consider the following products
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.
appleseed - appleseed is an open source, physically-based global illumination rendering engine primarily designed for animation and visual effects.
V-Ray - Learn why V-Ray for 3ds Max’s powerful CPU & GPU renderer is the industry standard for artists & designers in architecture, games, VFX, VR, and more.
Mitsuba - Mitsuba is a research-oriented rendering system in the style of PBRT, from which it derives much inspiration.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
LuxRender - LuxRender is a physically based and unbiased rendering engine.