Well kids, this time parents are playing! We created Tatadada Planning Poker App for our internal use but why do not share?!
estimating technique called planning poker is commonly used in agile to evaluate effort and/or relative volume of assigned tasks in software development.
This type of agile planning includes everyone from programmers, testers and database engineers to analysts, user interaction designers and more. Each estimator uses a deck of Planning Poker cards. Each card has one of the valid estimates on it, for example: 0, 1, 2, 3, 5, 8, 13, 20, 40 and 100.
Tatadada Scrum in digital version with simple interface and clear visual experience will make your planning meeting runs smoothly and ably.
More on planning poker (http://en.wikipedia.org/wiki/Planning_poker) and Agile (http://en.wikipedia.org/wiki/Agile_software_development) on Wikipedia.