I’m taking a Coursera course on gamification and as part of that I looked into what kind of things have been gamified and how. Here is a short list of the more interesting ones I found:
Epic Win: Gamified to-do list. For iPhone.
Duolingo: Language learning. At least partly free. Available online, has a iPhone app.
Trover: Travel photo app. For iPhone and Android.
ClassDojo: Teaching tool (they call it “behavior management software” - sounds creepy) . For many different platforms.
UP by Jawbone: Data collection app / tool for healthy living. Needs you to wear a wristband.
HabitRPG: A tool to turn chores/tasks into quests in a RPG. You also choose the rewards. Works in a browser.
Proof!: Turns any project into a social challenge. For iPhone or Android.