Rendering

RenderMan is the biggest name in this field but take your time to look around. V-Ray is the Architectural Design Visualization favourite and Turtle is used heavily in games.
 

RenderMan Courseware: Fundamentals

RenderMan Courseware: Fundamentals

HyperShot

HyperShot

RenderMan Studio

RenderMan Studio

V-Ray

V-Ray

Mental Ray

Mental Ray

Tutor Certification

Tutor Certification

RenderMan for Maya

RenderMan for Maya

RenderMan Pro Server

RenderMan Pro Server

Turtle

Turtle