Note:-This Article is only for education purpose
#1 Nessus : Premier UNIX vulnerability
assessment toolNessus was a popular free and
open source vulnerability scanner until they
closed the source code in 2005 and removed
the free "registered feed" version in 2008. A limited
―Home Feed‖ is still available, though it is only
licensed for home network use.
#2 Wireshark: Sniffing the glue that holds the
Internet together Wireshark (known as
Ethereal until a trademark dispute in Summer
2006) is a fantastic open source network
protocol analyzer for Unix and Windows. It
allows you to examine data from a live
network or from a capture file on disk. You can
interactively browse the capture data, delving down into
just the level of packet detail you need.
wireshark 32bit-download
wireshark 64bit-downlaod
#3 Snort : Everyone's favorite open source IDS
This lightweight network intrusion detection
and prevention system excels at traffic
analysis and packet logging on IP networks. Through
protocol analysis, content searching, and various preprocessors, Snort detects thousands of worms,
vulnerability exploit attempts, port scans, and other
suspicious behavior. Snort uses a flexible rule-based
language to describe traffic that it should collect or
pass, and a modular detection engine.
#4 Netcat : The network Swiss army knife
This simple utility reads and writes data across
TCP or UDP network connections. It is
designed to be a reliable back-end tool that
can be used directly or easily driven by other
programs and scripts. At the same time, it is a
feature-rich network debugging and
exploration tool, since it can create almost any kind of
connection you would need, including port binding to
accept incoming connections. The original Netcat was
released by Hobbit in 1995, but it hasn't been
maintained despite its immense popularity.
#5 Metasploit Framework : Hack the Planet
Metasploit took the security world by storm when
it was released in 2004. No other new tool even
broke into the top 15 of this list, yet Metasploit comes
in at #5, ahead of many well-loved tools that have been
developed for more than a decade.It ships with
hundreds of exploits, as you can see in their online
exploit building demo. This makes writing your own
exploits easier, and it certainly beats scouring the
darkest corners of the Internet for illicit shellcode of
dubious quality.
#6 Kismet : A powerful wireless sniffer
Kismet is an console (ncurses) based 802.11
layer2 wireless network detector, sniffer, and intrusion
detection system. It identifies networks by passively
sniffing (as opposed to more active tools such as
NetStumbler, and can even decloak hidden (nonbeaconing) networks if they are in use. It can
automatically detect network IP blocks by sniffing
TCP, UDP, ARP, and DHCP packets, log traffic in
Wireshark/TCPDump compatible format, and even plot
detected networks and estimated ranges on downloaded
maps.
you can download these softwares by just clicking on their names

#1 Nessus : Premier UNIX vulnerability
assessment toolNessus was a popular free and
open source vulnerability scanner until they
closed the source code in 2005 and removed
the free "registered feed" version in 2008. A limited
―Home Feed‖ is still available, though it is only
licensed for home network use.
#2 Wireshark: Sniffing the glue that holds the
Internet together Wireshark (known as
Ethereal until a trademark dispute in Summer
2006) is a fantastic open source network
protocol analyzer for Unix and Windows. It
allows you to examine data from a live
network or from a capture file on disk. You can
interactively browse the capture data, delving down into
just the level of packet detail you need.
wireshark 32bit-download
wireshark 64bit-downlaod
#3 Snort : Everyone's favorite open source IDS
This lightweight network intrusion detection
and prevention system excels at traffic
analysis and packet logging on IP networks. Through
protocol analysis, content searching, and various preprocessors, Snort detects thousands of worms,
vulnerability exploit attempts, port scans, and other
suspicious behavior. Snort uses a flexible rule-based
language to describe traffic that it should collect or
pass, and a modular detection engine.
#4 Netcat : The network Swiss army knife
This simple utility reads and writes data across
TCP or UDP network connections. It is
designed to be a reliable back-end tool that
can be used directly or easily driven by other
programs and scripts. At the same time, it is a
feature-rich network debugging and
exploration tool, since it can create almost any kind of
connection you would need, including port binding to
accept incoming connections. The original Netcat was
released by Hobbit in 1995, but it hasn't been
maintained despite its immense popularity.
#5 Metasploit Framework : Hack the Planet
Metasploit took the security world by storm when
it was released in 2004. No other new tool even
broke into the top 15 of this list, yet Metasploit comes
in at #5, ahead of many well-loved tools that have been
developed for more than a decade.It ships with
hundreds of exploits, as you can see in their online
exploit building demo. This makes writing your own
exploits easier, and it certainly beats scouring the
darkest corners of the Internet for illicit shellcode of
dubious quality.
#6 Kismet : A powerful wireless sniffer
Kismet is an console (ncurses) based 802.11
layer2 wireless network detector, sniffer, and intrusion
detection system. It identifies networks by passively
sniffing (as opposed to more active tools such as
NetStumbler, and can even decloak hidden (nonbeaconing) networks if they are in use. It can
automatically detect network IP blocks by sniffing
TCP, UDP, ARP, and DHCP packets, log traffic in
Wireshark/TCPDump compatible format, and even plot
detected networks and estimated ranges on downloaded
maps.
you can download these softwares by just clicking on their names


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