Where can I find FDist2 executable?
The link that ddiez has mentioned, has a download link for a zip file (fidist2). The zip file contains windows executables and C-codes. Just compile the C-codes in your terminal.

This is from the readme:


  The .exe files are pc binaries, which is only what most people want. I
  include the source file in case anyone wants to play with them. In
  this case compilation is e.g.: 

gcc -o fdist2 -O fdist2.c -lm
gcc -o cplot -O cplot.c as100.c as99.c -lm
gcc -o datacal -O datacal.c -lm



Actually in the readme, the first compile command says fdist.c (no such file) instead of fdist2.c. I corrected that here.

Your system should have gcc. I tried compiling in my system (linux) and it works. It should work in Mac too.