nmap free security scanner, port scanner, & network exploration tool. download open source software for linux, windows, unix, freebsd, etc.

snort is an open-source, free and lightweight network intrusion detection system (nids) software for linux and windows to detect emerging threats.

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Wireshark: The world's most popular network protocol analyzer

101Labs - Hands-on IT Certification training labs. Follow-along with our expert instructors as you learn to configure and troubleshoot networks, Linux, Security

Online Vulnerability Scanners to Identify Vulnerabilities and Map the Attack Surface. 28 Trusted Security Scanners and Free Network Tools.

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giac certifications develops and administers premier, professional information security certifications. more than 30 certifications align with sans training and ensure mastery in critical, specialized infosec domains. giac certifications provide the highest and most rigorous assurance of cyber security knowledge and skill available to industry, government, and military clients across the world.