Top 4 passive-scanner open source projects

PhoneInfoga is one of the most advanced tools to scan international phone numbers using only free resources. It allows you to first gather standard information such as country, area, carrier and line type on any international phone number. Then search for footprints on search engines to try to find the VoIP provider or identify the owner.

Subdomain discovery using the power of 'The Rapid7 Project Sonar datasets'

Hamster是基于mitmproxy开发的异步被动扫描框架，基于http代理进行被动扫描，主要功能为重写数据包、签名、漏洞扫描、敏感参数收集等功能（开发中）。

基于burpsuite headless 的代理式被动扫描系统