Bigfoot Networks Killer Network Manager is built from the ground up to give you unequaled speed, intelligence and control over your online game data, Killer Network Manager shows you the health and performance of your online gaming PC and gives you the controls to optimize it. It is a freeware auditing application.
Here are some screenshots to illustrate the features and user interface of this application:
NxFilter
Burp Suite
PRTG Network Monitor
Snort
MiTeC Network Scanner