Use GlassWire to Monitor Your Bandwidth

is a great firewall application for Windows that does a lot more than just block incoming connections. It’s also really amazing for monitoring your bandwidth usage.

The default view when you launch it shows you a graph of all network activity in real-time, which is pretty great, but once you switch over to the Usage tab you’ll see the real power of this application.

You can see your bandwidth usage by connection, whether it’s incoming or outgoing, and even drill down into individual apps to figure out exactly what is taking up so much bandwidth.