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.
Gadgetbridge - A free and cloudless replacement for your gadget vendors' closed source Android applications.
Motiv Ring - A fitness tracker you can truly keep on
Tep - Fitness tracker meets tamagotchi. Don't starve it!
Strava - The #1 app for runners and cyclists
Nike+ FuelBand - Nike+ FuelBand is the product of Nike Inc.