the exploit database - exploits, shellcode, 0days, remote exploits, local exploits, web apps, vulnerability reports, security articles, tutorials and more.

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

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

vulnerability database enriched with millions cve, exploits, articles, varied tools and services for vulnerability management against cybersecurity threats

Stay ahead with top Linux news, security advisories, expert how-to guides, and cutting-edge feature releases. Your go-to hub for all things Linux.

actionable vulnerability intelligence and vulnerability management for every company.

information security software for open computing environments, related publications, and professional services

zone-h - unrestricted information - a global view to the world with a stress on the itsec

SANS Institute is the most trusted resource for cybersecurity training, certifications and research. Offering more than 60 courses across all practice areas, SANS trains over 40,000 cybersecurity professionals annually.

OWASP Foundation, the Open Source Foundation for Application Security on the main website for The OWASP Foundation. OWASP is a nonprofit foundation that works to improve the security of software.