What are some alternatives?
When comparing Sunflow Rendering System and Blender, you can also consider the following products
RenderMan - Advanced Technology from Pixar Animation Studios for Rendering VFX and Animation
Unity - The multiplatform game creation tools for everyone.
appleseed - appleseed is an open source, physically-based global illumination rendering engine primarily designed for animation and visual effects.
Cinema 4D - Cinema 4D is a 3D modeling, animation, motion graphics and rendering application.
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.
Mitsuba - Mitsuba is a research-oriented rendering system in the style of PBRT, from which it derives much inspiration.