GetBadges - GetBadges is a gamification platform which allows developers to play and compete while using software development tools.
Momentum - Agile goal and performance management
HabitScript - Gamify your coding time
New Tab by Flickr - Get a beautiful photo each time you open a new tab
Goals & Challenges by Fini - A social way to gamify goals and habits with challenges
Gratitude Flow - Gratitude Flow is a web extension that allows you to share and receive gratitude on your new tab with real people around the world.