Nessus Home allows you to scan your personal home network (up to 16 IP addresses per scanner) with the same high-speed, in-depth assessments and agentless scanning convenience that Nessus subscribers enjoy. It is a freeware network scanning 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