The acceptable applications are: 3ds Max, Maya, Blender, SolidWorks, Cinema 4D, Rhino. Tell me which one and renderer you are planning to use.
I cannot stress this enough: I will need source files on demand. While screenshots are nice, I need source files (*.max, *.mb, *.blend, *.sldasm, *.c4d, whatever) in order to supervise your ongoing work. If you believe in delivering the source files at the end, please move on, do not waste your time and mine. It is unbelievable the number of designers that demand me to pay without seeing the produced files first, to place my blind trust in them. I blame Freelancer for not making this a more clearly enunciated policy.