OS

What OS is ROCK Pi S running?

Currently we have Debian Buster, Armbian and Slackware Linux running on ROCK Pi S.

Can I ssh to ROCK Pi S running official Debian?

Yes, you can. The ROCK Pi S is shown as rockpis.local in your local network. Check out the Using SSH page.

Addons

Where is the PoE HAT for ROCK Pi S? I can't find it anywhere

As the time of writing, the PoE HAT for ROCK Pi S is still under development. We are planning two versions of PoE HAT for the S, the standard 802.3af one and the passive PoE one.