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HackDB is the ultimate directory for offensive security, providing a curated database of resources for red teaming, penetration testing, and ethical hacking.

OffSec delivers cyber workforce resilience through skills development, hands-on learning platform, and a comprehensive library.

Free web application security training platform by PortSwigger, offering learning materials, labs, and progress tracking for cybersecurity professionals.

AI Red Teaming Playground Labs: Challenges for AI red teaming training, covering adversarial ML and Responsible AI failures.

APIsec University offers free API security training courses to help you find API vulnerabilities and keep your APIs secure.

Adversary simulation provider offering manual penetration testing, phishing assessments, offensive security training, and technical tool development.

BugBountyHunter.com offers training and resources for aspiring bug bounty hunters, focusing on web application vulnerabilities and practical skills.

The HTB Certified Penetration Testing Specialist (CPTS) certification validates practical penetration testing skills and knowledge.

CREST Practitioner Security Analyst (CPSA) is an entry-level certification assessing skills in operating systems and network services.

The CREST Registered Penetration Tester (CRT) exam validates skills in assessing networks, systems, and web applications.

CTFd is a Capture The Flag framework for cybersecurity training, developer skill enhancement, and student education, offering easy CTF event creation.