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LinuxQuestions.org offers a free Linux forum where Linux newbies can ask questions and Linux experts can offer advice. Topics include security, installation, networking and much more.

CentOS -- Community ENTerprise Operating System is a free rebuild of source packages freely available from a Prominent North American Enterprise Linux vendor.

LinkedIn strengthens and extends your existing network of trusted contacts. LinkedIn is a networking tool that helps you discover inside connections to recommended job candidates, industry experts and business partners.

On-line Linux and Open Source Technology Books and How To Guides

Linux tips, tricks and configuration details for server and desktops.

Wordpress Themes, Drupal Themes, vBulletin Styles, Skins, Joomla Templates, Yahoo Store CSS Design, OSCommerce

The Linux Documentation Project is working towards developing free, high quality documentation for the Linux operating system. The overall goal of the LDP is to collaborate in all of the issues of Linux documentation.

OmniSecu.com is a web site dedicated to networking, system administration and system security. Free online tutorials to master networking, system administration and network security. Free online lessons and guides for IT certifications like MCSE (Mic...

Comprehensive CVE vulnerability database that integrates all U.S. Government publicly available vulnerability resources. Repository of information technology security content automation.