What is the software for monitoring the status of the local network and Internet connection?

Question

Software and Internet Services

And not by means of a router. For example, to see who is connected to the network, who receives / transmits how much traffic, some logs, the ability to provide or block access to the Internet / network, etc.
Maybe advise something, or give a link to a review article.

Answer 1

that is, you want monitoring with a live router? Not okay!