Gadgetbridge - A free and cloudless replacement for your gadget vendors' closed source Android applications.
Amazfit GTS WatchFaces - Amazfit GTS WatchFaces is an app that allows you to access new and beautiful watch faces for your smartphones.
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.
Mi Heart rate - Continuous HR and smart alarm
Strava - The #1 app for runners and cyclists
Huawei Wear - Huawei Wear is an application that allows you to manage your Huawei smartwatch no matter what model it is, i.e., Huawei Watch, Huawei fit, and Huawei talk band wristbands.