iReward

Name: iReward
Price: Free or $3.99
Features: iReward is a digital way to organize a rewards system. This app features the ability to add multiple charts for multiple children. It seems to be marketed towards parents, but since the systems and rewards are customizable, they would work perfectly for teachers. You can use different types of charts and add different types of rewards and points systems.
Likes/Dislikes: This is an easy way to keep track of a participation or behavior system, and if all students have access to technology they could even become responsible for updating it themselves. However, it may not have the kind of effect and the nuances that a traditional classroom behavior/participation system might. It seems a little simple, and if you don't have ready access to technology to use it, it might be easier to do a paper or chart-based system.
Recommend: Probably.