On freebitco.in's high/low gambling page if you open up console and enter this script than the website will automatically place your high/low bets based off of Martingale's Probability Method.
This method has a chance of exponentially increasing the Bitcoin you have on the faucet site by placing automated, intelligent bets at high speeds. Although I cannot guarantee profits (this is gambling) I have used this and gotten some significant profit.
After running this for a minute or two you will notice a profit so I recommend taking the difference and not being too risky.
Enjoy but be smart!