AsteroidOS 1.0 supported the following devices:

LG G Watch, LG G Watch Urbane, LG G Watch R
Asus Zenwatch 1, Asus Zenwatch 2, Asus Zenwatch 3
Sony Smartwatch 3
Software emulator for testing and development

AsteroidOS 2.0 adds more:

Fossil Gen 4, 5, 6 watches
Huawei Watch and Watch 2
LG Watch W7
Moto 360 2015
MTK6580 (harmony/inharmony) – I assume a range of devices based on MT6580
OPPO Watch
Polar M600
Ticwatch C2+ & C2, Ticwatch E & S, Ticwatch E2 & S2, TicwatchPro, Pro 2020 and LTE, and Ticwatch Pro 3