jrMan renderer is an open source version of the Reyes rendering algorithm used by Pixar's PhotoRealistic RenderMan, implemented in Java by Gerardo Horvilleur, Jorge Vargas, Elmer Garduno and Alessandro Falappa.
PhotoRealistic RenderMan (PRMan), a RenderMan Interface Specification-compliant rendering software system developed by Pixar based on their own interface specification
RenderMan Artist Tools, also known at R.A.T. is a set of plug-ins and tools produced by Pixar for better integration of Pixar Animation Studio's PhotoRealistic RenderMan and Autodesk's Maya.