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Suricata
Suricata is a high performance Network IDS, IPS and Network Security Monitoring engine. Open Source and owned by a community run non-profit foundation, the Open Information Security Foundation (OISF).
ct-dev
tcpflow
tcpflow is a program that captures data transmitted as part of TCP connections (flows), and stores the data in a way that is convenient for protocol analysis and debugging.
Nmap
Nmap (“Network Mapper”) is a free and open source utility for network discovery and security auditing.
TryHackMe
Learn cyber security with fun gamified labs and challenges. Good for beginners and professionals.