Cool Tool GlassWire.
Network Monitor, Threat Monitoring and Free Firewall, on one, simple, free and cool tool..
See what happens on your network, be pro-active and protect it. With a graphical interface you can see what exactly pass through your network. Use filters by traffic types or by application, monitoring to examine possibly unwanted network traffic, use firewall to find and block apps that dry out your bandwidth, see alerts for new connections and so many other information.
For the moment, GlassWire is currently free but the company has plans to offer more new features in the future for paying supporters.
You can find it here: