Attached Link: http://www.dotcsw.com/links.html#renderers

BMRT, a popular freeware raytracing RenderMan implementation was available from 1998 to 2002 (then discontinued after sued by Pixar). It didn't have true displacements from the start, but got them in version 2.5.6. RenderDotC is not as popular as BMRT was (yet it was used in "Matrix"), is a REYES renderer available since 1996 and pricing ranges from $0 (limited in resolution) to $2,995 ("Film edition"), depending on the output resolution limit. Tempest, the renderer also known as FireFly, was born in 2000 and sells with its host app Pixels:3d for $399. The reason why micropolygon displacement is not very popular is 1) raytracers are much easier to implement than REYES renderers 2) micropolygon displacement and raytracing or global illumination don't mix well