Hi Kinshuk Shekhar ,

This paper compares few applications that is used for Heliostat modelling,Conference Paper Comparison of Optical Modelling Tools for Sunshape and Surfa...

and shows few free applications that can find on Github:

https://github.com/NREL/SolTrace

https://github.com/pablo-benito/tonatiuh

you may check them for field optimization.

and below question also discuss about few applications:

https://www.researchgate.net/post/Is-that-visual-HFLCAL-free-or-is-there-a-similar-free-software

And below 2 repositories discusses about comparison of few applications:

https://github.com/linxxcad/QMCRT

https://github.com/anustg/optics-verification

And I suggest referring below paper if you are interested:

https://www.osti.gov/servlets/purl/1140911

Further please check slide 3 of below presentation:

http://apvi.org.au/solar-research-conference/wp-content/uploads/2019/12/Wang-Ye-Incorporation-of-Solstice-Ray-tracing-into.pdf

As I found so far it's worth developing new application in this field and if you even prefer so hope above resources will help you.