Software for bandwidth management

[Paul Stuffins]

Afternoon Everyone,

I have a spare desktop lying around here that I want to turn into a basic
bandwidth monitor, along with various other things including website
filtering.

I have seen https://www.untangle.com, which I believe is based on FreeBSD,
but I am not keen on paying the $50 a month for a license, is there any
software that anyone can recommend to me?

My needs, to start with, are basically to monitor what devices are
connected, and how much each device transfers on a hourly/daily/monthly
basis, and potentially apply limits to each device.

Many Thanks
Paul