I am afraid monitoring individual devices in a home network is a rather challenging and often impossible task.
There is no software in existence that you can install on one computer and that would magically show and monitor every device you have. The reason for that is how computer networks work physically, and generally the only solutions are advanced routers or custom firmware.
Here is an article on
how to install custom firmware on popular routers and monitor devices individually. The downside to this is that it requires certain IT skills and there is a risk of bricking your router if things go wrong, so please proceed only if you are very confident in your abilities.