Modelling and rendering software:

Cinema 4D

Bryce from DAZ

POV-Ray 3.5

Scientific Images:

Medical Illustration
Information for scientific illustrators, medical illustrators, graphic designers that specialize in medical content, and those who hire them.

Molecular modelling software:

Chimera

Deep View - The Swiss pdb Viewer

Viewer Pro modelling from Accelrys

Graphics sites: