I know only one currently, MeVu, the sports betting platform. The fact that it resides on the blockchain makes it particularly apt for the renewal of sports betting in the wake of its legalization. Users can bet on sports teams with a friend or as a part of a broader competition, and winnings are automatically paid out at the conclusion of the event. With auditable records and minimal regulatory interference, MeVu assuages the fears of professional sports leaders while providing a safe, fun environment for people to re-enter the sports betting arena.