Algumas que já usei e que gosto bastante:
Snort – Flexible Network Intrusion Detection System
Tshark – Wireshark network traffic analyzer (console interface)
WireShark – Wireshark network traffic analyzer
Kismet – Kismet is a 802.11b wireless network sniffer
Nmap – Nmap is a utility for network exploration or security auditing
Traceroute – Traces the route taken by packets over an IPv4/IPv6 network
Whois – This is a new whois (RFC 3912) client rewritten from scratch
host – DNS lookup utility
Chkrootkit – Checks for signs of rootkits on the local system
Wipe – Secure file deletion
Aide – Advanced Intrusion Detection Environment
TripWire – file and directory integrity checker
Debsums – Verify installed package files against MD5 checksums
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