Nmap is an excellent analytical tool used in the past and the new version 6 has been officially released

https://isc.sans.edu/diary/nmap+6+released/13267

http://nmap.org/6/

QUOTE:  May 21, 2012—The Nmap Project is pleased to announce the immediate, free availability of the Nmap Security Scanner version 6.00 from http://nmap.org/. It is the product of almost three years of work, 3,924 code commits, and more than a dozen point releases since the big Nmap 5 release in July 2009. Nmap 6 includes a more powerful Nmap Scripting Engine, 289 new scripts, better web scanning, full IPv6 support, the Nping packet prober, faster scans, and much more! We recommend that all current users upgrade.

Contents:

  1. About Nmap
  2. Top 6 Improvements in Nmap 6
  3. Press
  4. Screen Shots
  5. Detailed Improvements
  6. Moving Forward (Future Plans)
  7. Acknowledgments
  8. Download and updates