NetSecL Linux is by default with hardened configuration leaving the distribution at a security level where it is still usable and providing the tools needed to test your security. GrSecurity and it's firewall are features that makes the distribution unique along with specially compiled packages:
You'll find top tools like
... and many others
At first the NetSecL Project started under the name ISlack and was developed by the time when Yuriy Stanchev (NetSecL Project Leader) was in Germany - the distribution was spread among friends and after a year of usage and testing it was uploaded on http://ftp.iasi.roedu.net on 03-May-2005 18:52. From that point it evolved and became what it is today.
Click here to go to their official website.
All donations go towards the expansion project of Linux Freedom