wasp-os - Firmware for smart watches based on the nRF52 family of microcontrollers (including Pine64 PineTime)
Wear Gesture Launcher - Wear Gesture Launcher – Wear OS – Wear Launcher that lets you forget about swiping that long of small icons, just tap, draw, and do.
InfiniTime - InfiniTime is an open-source, C++-based firmware OS specifically made for the PineTime smartwatch.
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.
watchOS - Apple's new OS for the Apple Watch ⌚
Wear Mini Launcher - Wear Mini Launcher is one of the best launchers created for Android Wear Devices.