Seeking Affordable Raytrace Software for Throughput

This is somewhat of an extension of tosik's recent post.

I work a bit with weak optical signals for PMTs and spectrometers and I am always trying to optimize the light collected by a system. Galilean collimators, grin lenses, Keplerian telescopes and other constructs are useful for capturing the most light and focusing it on a detector.

I have used geometrical ray trace programs to check my lab work but a lot of them don't seem to have features to report the final output signal with respect to the input aperture. Usually you can trick the graphics or do something else to accomplish this, however does anyone have experience using a product for under $500 that explicitly does this?

thanks
Fritz