Gadgetbridge - A free and cloudless replacement for your gadget vendors' closed source Android applications.
Strava - The #1 app for runners and cyclists
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.
Runtastic - Runtastic offers a series of fitness apps that can be used to track your running, walking, hiking, and cycling, as well as many other fitness routines. Read more about Runtastic.
MyFitnessPal - Track the number of calories that you consume each day with MyFitnessPal. The app also lets you create a diet and track the exercise that you complete each day whether it's walking, running or some other type of program.
Polar Loop 2 - Polar Loop 2 is a digital activity tracker for those who wants to track their activity 24/7 and are interested in to reach activity goals via smart guidance.