NetworkTrafficView (free): summary of all of the traffic on a network adapter

From http://www.nirsoft.net/utils/network_traffic_view.html:

I recommend using it with the driver from Microsoft's Network Monitor. There can be differences in packet capturing ability depending on whether you use a wired or wireless network adapter - see http://superuser.com/questions/571553/wireshark-help-seeing-all-network-traffic. I've personally seen a situation in which Microsoft Network Monitor on a wired network adapter could see some traffic on a computer that couldn't be seen with Microsoft Network Monitor on a wireless network adapter, nor with Wireshark either on a wired or wireless network adapter.

 

The data can also be grouped by process.