Always up for a little friendly wager with your buddies or coworkers? Parlay can help you keep track of those bets. All you need to do is select you and your friend, set the "parlay," and the stakes. The stakes could be everything from cash, to picture challenges (maybe costumed punishments), to charity challenges, where the loser or winner has to donate to a specific charity. Parlay supports charities such as Girls Who Code, Charity: Water, Watsi, and Pencils of Promise. The Android and iOS app also lets you view what other people are challenging each other on. You can respond to those with emojis or encouragements.  

Source: Lifehacker | Download: Google Play Store (Free) + Apple App Store (Free)