Mi Heart rate - Continuous HR and smart alarm
HitFit Pro - HitFit Pro is an app that allows you to connect your smartwatch to your smartphone and let them work together.
Amazfit GTS WatchFaces - Amazfit GTS WatchFaces is an app that allows you to access new and beautiful watch faces for your smartphones.
wasp-os - Firmware for smart watches based on the nRF52 family of microcontrollers (including Pine64 PineTime)
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.
DayBand - DayBand is an app that connects your smartwatch to the smartphone and syncs all the sensors data to give a performance chart and metrics.