Receipt Hog - A fun and rewarding way to turn everyday shopping receipts into cash.
Google Opinion Rewards - Answer quick surveys and earn Google Play credits with Google Opinion Rewards.
Fluz - REAL Cash Back - Amazon, Gas, Groceries, Cell Phone Bill and HUNDREDS More.
Dosh - Cash back, auto-magically
FreeMyApps - FreeMyApps lets you get rewarded for watching cool videos, playing fun games, and trying new apps.
Verydice - Verydice is a casual application where you can roll the dice to win tickets and free real stuff without any effort.