most used rendering softwares?
2 Answers

http://www.rockthe3d.com/25-best-3d-rendering-software/
https://en.wikipedia.org/wiki/List_of_3D_rendering_software
You won't get everyone to agree on what is the best. I like Keyshot, but someone will ague about the lack of volumetric lighting. If that feature is important for your work, your "best" program will be different from mine.