Frustablilty

    Surveys On The Go: iOS / Android
    Gigwalk: iOS / Android
    Ibotta: iOS / Android
    Shopkick: iOS / Android
    CheckPoints: iOS / Android
    App Trailers: iOS / Android
    Iconzoomer: iOS / Android
    GymPact: iOS / Android
    ESPN Streak for the Cash: iOS / Android
    Phewtick: iOS / Android
    NPolls: iOS / Android
    Mobile Rewards: iOS / Android
  
    Locket: Android
 
http://www.problogbooster.com/2014/01/mobile-app-earning-cash-reward-free-money.html