Not a vulnerability scan but real hackers ...

IDGuard v0.60


Network-Wide Fingerprinting Prevention at the Switch

Features
  • IPv4, IPv6, and TCP normalizations

  • Authorized Activity Exclusions

  • Linux Kernel Module Implementation

Download Here.

Adaptive Network Protocol (ANP) v1.0.1


Adaptive Network Protocol (ANP) is a free and open-source solution for sharing events between systems

Download Here.

SANS Top-20




Top Ten Network Security Tips


Wondering what the "best practices" are for securing your network? There is a very informative document called "The 60 Minute Network Security Guide" on the National Security Agency Web site (www.nsa.gov). Here's a brief summary ...