Ethereal

"A network analyzer that lets you capture and interactively browse the contents of Ethernet frames. Packet data can be read from a file, or live from a local network interface."

(http://www.freebsd.org/cgi/url.cgi?ports/net/ethereal/pkg-descr)

Ettercap

"Ettercap is a suite for man in the middle attacks on LANs. It features sniffing of live connections, content filtering on the fly and many other interesting tricks. It supports active and passive dissection of many protocols (even ciphered ones) and includes many features for network and host analysis."

(http://www.freebsd.org/cgi/url.cgi?ports/net/ethereal/pkg-descr)

Fping

"Fping is a ping like program which uses the Internet Control Message Protocol (ICMP) echo request to determine if a host is up."

(http://www.fping.com/)

Gnome

Gnome is a desktop program.

GTK

"The GIMP ToolKit (GTK+) is a collection of GUI widgets. GTK+ essentially provides the building blocks from which GUIs can be built."

(http://www.gtk.org/)

Hacker

An expert or enthusiast of any kind. Hackers enjoy the intellectual challenge of creatively overcoming or circumventing limitations. This is a good thing.

Do not, under any circumstances, get this confused with people who are malicious users. These people are to be referred to as "assholes", "crackers", "script kiddies", or any number of nasty and degrading names which are not usually mentioned in polite company.

Hping

"Hping is a command-line oriented TCP/IP packet assembler/analyzer."

(http://www.freebsd.org/cgi/url.cgi?ports/security/hping/pkg-descr)