Broadband Reports
http://www.dslreports.com/scan
CERT
http://www.cert.org
Cryptcat
http://sourceforge.net/projects/cryptcat/
DoS Help
http://www.doshelp.com/dostest.htm
Firewalk
http://www.packetfactory.net/projects/firewalk/
fragroute
http://www.monkey.org/~dugsong/fragroute/
hping
http://www.hping.org
ID Serve
http://grc.com/id/idserve.htm
IEEE OUI and Company_id Assignments
http://standards.ieee.org/regauth/oui/index.shtml
IP Calculator / IP Subnetting
http://jodies.de/ipcalc/
IP-Tools
http://www.ks-soft.net/ip-tools.eng/
ISECOM Security Tools
http://www.ideahamster.org/projects/operationaltools.htm
John the Ripper
http://www.openwall.com/john/
L0phtCrack LC4
http://www.atstake.com/research/lc/
libevent
http://www.monkey.org/~provos/libevent/
LibWhisker
http://www.wiretrip.net/rfp/lw.asp
Netcat
http://www.atstake.com/research/tools/network_utilities/
GNU Netcat
http://netcat.sourceforge.net
Nessus
http://www.nessus.org
Nikto
http://www.cirt.net/code/nikto.shtml
Nmap
http://www.insecure.org/nmap
The Packetfactory
http://www.packetfactory.net
Packetstromsecurity
http://packetstormsecurity.nl
Tenable Security
http://www.tenablesecurity.com
Razor Security
http://razor.bindview.com
Reverse WWW Shell
http://www.megasecurity.org/Sources/rwwwshell-1_6_perl.txt
Sam Spade
http://www.samspade.org
SANS
http://www.sans.org
SecurityFocus
http://www.securityfocus.com/
SNMPwalk
http://www.ece.ucdavis.edu/ucd-snmp/
Snot
http://www.stolenshoes.net/sniph/index.html
SSL Proxy
http://www.obdev.at/products/ssl-proxy/index.html
Stick
http://www.eurocompton.net/stick/projects8.html
Virusdot.org
http://www.governmentsecurity.org/articles/DefaultLoginsandPasswordsforNetworkedDevices.php
Whisker+SSL
http://www.digitaloffense.net