This app let's you control your devices using Wake on Lan.

Multiple devices can be configured in the app which can later be controlled either from the app itself from up to three Quick Settings Tiles or from Androids "Device Control" area.
Each device's online status is displayed in the list overview depending on the reachability (using "ping") of their configured "Status IP".

Devices can be shut down remotely by setting all of the required fields under the "Remote Shutdown" configuration.
Please note that Remote shutdown uses SSH to execute the Shutdown-Command so this functionality only works on Linux machines.

The command to shut down the device also needs to be able to be run without prompting for sudo credentials. This can be tested using the button in the device's configuration.

The companion app for Wear OS let's you control your devices directly from the watch.

Source Code available at https://github.com/Florianisme/WakeOnLan

Computer Illustration from: https://www.vecteezy.com/vector-art/4211988-desktop-computer-device