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Insecure.Org - Nmap Free Security Scanner, Tools & Hacking resources
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VueScan Scanner Software for macOS Catalina, Windows 10, and Linux
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Angry IP Scanner - the original IP scanner for Windows, Mac and Linux
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UnixGuide.net
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Nmap: the Network Mapper - Free Security Scanner
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strongSwan - IPsec VPN for Linux, Android, FreeBSD, Mac OS X, Windows
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w3af - Open Source Web Application Security Scanner