Linuxbroker provides all types of resources you need like Linux newsgroups search engine, daily news, howtos, applications releases tracking and security alerts.

This site on Linux and security covers firewalls (iptables), intrusion detection systems (snort), securing services, and Linux security in general. The aim is to provide information about protection, detection, and reaction with respect to attacks.

Designed for System Administrators, to handle user logins for several computers running Linux. It works with a console interface, based on the CDK library that uses ncurses. Import data from csv files and export to text files with a free definable format.

Praetor is a kernel-based "Security Enabler" for Linux that provides fine-grained access control.