My wife and I recently started using Habitica (formerly called HabitRPG). The extent to which each of us is engaging in good habits and doing tasks we plan on doing is now visible to each other in the form of character levels and hit points (but the specific items are not). This makes it possible for us to hold each other accountable for improving ourselves without having to nag.

Overall I've gone from making good use of ~10% of my free time to making good use of ~30%. I've still got quite a ways to go, but this is significant progress.