OK, looked at the questions, wondered myself.

Limited support, you can track health/sleep if you tie in gadgetbridge, no voice commands.

base features:

Agenda Alarm clock Calculator Music controller Settings Stopwatch Timer Weather app Up to 48 hours of battery

AsteroidOS 2.0 features:

Always‑on display Tilt‑to‑Wake Customizable QuickPanel Multiple launcher styles Nightstand mode Performance improvements Support for ~30 devices

https://asteroidos.org/ https://gadgetbridge.org/ (with active development for asteroid)