Wear OS Center - Wear OS Center – Android Wear Apps, Games, and News is an all-in-one launcher for your smartwatch that delivers all your Android Wear apps and watches faces all in a single place.
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)
Mi Heart rate - Continuous HR and smart alarm
InfiniTime - InfiniTime is an open-source, C++-based firmware OS specifically made for the PineTime smartwatch.
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.