Resources focused on external perimeter testing, including internet-facing infrastructure, exposed services, DNS, and attack surface discovery.

Unified exposure management platform for automated vulnerability scanning, attack surface monitoring, and cloud security posture management.
Kali Linux is a Debian-based distribution for penetration testing, ethical hacking, and network security assessments, offering a vast array of tools.

NeroSwarm Deception Lab offers free cyber deception tools including honeytoken creation, honeypot script generation, and IP threat reputation checking.

Nerva is a high-performance CLI tool for fast service fingerprinting across 120+ protocols (TCP/UDP/SCTP), built by Praetorian for network reconnaissance.