Similar to Cacti

Metasploit

Midnight Commander

Netcat

Netstat

NetworkManager

NPF (firewall)

Ns (simulator)

Open Transport

OpenWrt

OTRS

Pandora FMS

PF (firewall)

Ping (networking utility)

Point-to-Point Protocol daemon

Proxomitron

Rdesktop

Route (command)

Rsync

Samba (software)

Squid (software)

TCP Wrappers

Tcpdump

Telepathy (software)

Traceroute

TUN/TAP

Twisted (software)

UIP (software)

Unison (software)