The free demo version from this site:
https://facegen.com/modeller.htm
A few tips:
Modify>>Demographics is a big one. Put asymmetry about halfway between none and the next hashmark.
If working with black and white photos, always adjust the color. Usually somewhere between typical and none.
For players with beards, the modeller will often give them weird chins, for some reason. Fix this with Modify>>Shape>>Jawline and move further over to the convex side.
Got a player you're trying to make a facegen of, but can't find any photos where he isn't showing a big, derpy, toothy grin? Derp grins are Public Enemy Number 1 in the facegen-making game. Try to set the markers at the ends of the mouth towards the middle of the grin as much as you can, then use Modify>>Shape>>Mouth - Lips Thick/Thin and move it over to thin as much as it take to get rid of the stupid toothy look. The overbite/underbite feature can also be adjusted a bit in this regard...and if all else fails, use Photoshop or GIMP to wipe that stupid grin right off his face!
You may need to use Modify>>Color for some features. Particularly making eye whites whiter or eyebrows and facial hair darker.
Have fun! Looking forward to seeing what you can do with it!