First of all forget free scripts, nulled ones and etc, all of them are risky to use and there was accident on bitcointalk that one user published dice script for free and those who used that on their websites, became victim of him and lost money.
Check this thread too: https://bitcointalk.org/index.php?topic=1065017.msg11414986#msg11414986
Overfeat has good scripts, two casino that have ANN thread on this forum are using their bitcoin casino script and personally I can say that it had amazing UI, features and everything worked pretty well, couldn't say that it was bought script until casino owner stated that himself.
So I think it worth to keep an eye on their faucet script and with some help modify on your own: https://overfeat.com/p-bitcoin-faucet-script
It has a lot of features and you can view demo version + demo control panel.
Good luck!