Gadgetbridge - A free and cloudless replacement for your gadget vendors' closed source Android applications.
LifeSum - Set a weight goal and we'll tell you how to reach it!
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.
Fuel - Fuel is a data pipeline framework for machine learning.
Strava - The #1 app for runners and cyclists
Dutrition - With Dutrition you can create daily diet plans and share them with your friends.