Similar to Tcpdump

Netcat

Kismet (software)

Metasploit

Ping (networking utility)

Wireshark

Avahi (software)

HTTrack

Iptables

Rsync

CUPS

Emacs

FIGlet

File System Visualizer

Fontconfig

GNU Core Utilities

GNU Emacs

Pcap

Traceroute

Packet analyzer

ALTQ

Cacti (software)

DD-WRT

Firewalld

Wget

Icinga

Ipfirewall