Headspace - Meditation made simple. Brilliant things happen in calm minds.
Social Pomodoro - Meet an accountability buddy for 25 minutes of focused work.
Medito - 100% Free Meditation App that will improve your Mental wellbeing with the help of Guided Meditations, Breathing Exercises, Mindfulness Practices, Relaxing Sounds, and more.
Focusmate - Distraction-free productivity via virtual coworking
Calm - Calm.com can help you reduce stress and increase calm.
Habit List - Create good habits and break bad ones with the app that keeps you focused.