Here is a simple mobile app I helped my son write. He is a big Risk fan and this seemed like a great way for him to get introduced to android development.
See: Risk Dice Roller
Risk Dice Roller is a simple app designed to replace dice needed for the original risk board game. It automates the rolling process and keeps history and statistics of each players rolls. You can even automate larger battles and watch as your large army takes on the defenders. It can be really fun to compare player stats and its effect on the outcome of the game.