GoalsWon - Human accountability coaching for busy people
fitbit - The Fitbit mobile app is for people who use Fitbit fitness trackers to keep track of their activity goals, food plans, and other fitness related things. Read more about fitbit.
Beeminder - Beeminder
Apple - Available on iOS
Coach.me - Coach.me is a coach that goes everywhere with you, helping you achieve any goal, change any habit, or build any expertise.
Fitbit Charge - Activity and sleep tracking wristband