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A list of smarthome devices designed to be PoE-first. In general, these are devices that work well (or at all) with Home Assistant. Due to that, I've included details on which integration allows the device to be added to HA.
Cameras on PoE is very standard, so this list should only be cameras that include extra sensors. Note that the Unifi cameras require an NVR or Dream Machine to operate.
Thin client with a low enough power draw that it can be PoE-powered with an adapter that has a barrel splitter. Similar performance as a RPi4.
Honorable Mentions
These devices aren't PoE for various reasons, but fit the theme of avoiding either DC wall warts or wifi. Some need/control more power by definition but still use ethernet for data, and others may just be USB-powered devices that are [usually] convenient to power via a PoE->USB converter (but still use wifi for their data).
Ethernet-controlled power strips/distribution. Expensive new, but can be extremely cheap on eBay. Generally used on higher-end smarthome with Control4, Crestron, etc. Three-outlet version are usually ~$30, and rack mountable 8/16 plug units for ~$100. Supported via a custom component in HA.
ESP32-based heat pump controller (for Mitsubishi and other brand mini splits). Technically it gets its power via the heat pump's CN105 plug, so not really mains powered. But you can get a version with ethernet.
Smart home energy monitor (power not needed since it wires durectly into breaker). Ethernet connected.
USB-Powered Hubs
The following hubs are nicely-equipped with USB power ports that are easily powered using PoE splitters (example). They use ethernet for data as well, so thie hit the power+data requirement in a roundabout way.
This list is nowhere near exhaustive. Please feel free to add others in a PR.
Lutron Caseta Hub
Philips Hue Hub
Hubitat
Home Assistant Green
PoE → USB
Okay, these are just USB devices. But they are ones that are very well-suited for a converter because of their physical design, as described below.
It's mounting bracket is sized to fit right over a traditional one-gane box, and the USB cable is routed so that it would be completely invisible if it were wall-mounted.
Yes, it is a z-wave device! But it is wall-mounted and PoE lets you never worry about recharging it. It's USB cable is routed so that it can be totally hidden. Mounts over a one- or two-gang box with a 3D-printed faceplate.
Footnotes
Requires a Unifi NVR or Dream Machine to function. ↩↩2↩3↩4↩5↩6↩7↩8