ProjectDiscovery

ProjectDiscovery develops open-source security tools focused on reconnaissance, asset discovery and vulnerability research. Its ecosystem includes well-known tools such as Nuclei for template-based vulnerability scanning, Subfinder for passive subdomain discovery, httpx for HTTP probing and Naabu for port discovery. Security researchers and application security teams use these tools to automate repetitive parts of authorized security testing and external attack surface analysis. ProjectDiscovery also provides cloud services that extend the open-source tooling into managed workflows for asset discovery and vulnerability management. The projects are widely used by penetration testers, bug bounty researchers and defenders who need scalable ways to map internet-facing infrastructure and identify potential weaknesses. Because these tools can be powerful, they should be used only on systems where the operator has permission to test. The companys strongest differentiator is its emphasis on automation and reusable security research workflows.