iOS and Android App (Google Play): Roll for It! - FREE
This the official app version of the physical dice game (made by Calliope Games). Its originally $1.99 on Google Play and iTunes, but is currently free. I have both the physical dice game, as well as the app. It's well made and fun for kids and adults.
WARNING NOTE: In-app purchases are available for this app, but you don't need to buy them to play with the dice that are available with the base free purchase.