1、 Nessus
http://www.nessus.org
2、 Netcat
http://www.l0pht.com/~weld/netcat/
3、 Tcpdump
http://www.tcpdump.org
4、 Snort
http://www.snort.org
5、 Saint
http://www.wwdsi.com/saint/
6、 Ethereal
http://ethereal.zing.org/
7、 Whisker
http://www.wiretrip.net/rfp/p/doc.asp?id=21&iface=2
8、 Internet Security Scanner
http://www.iss.net
9、 Abacus Portsentry
http://www.psionic.com/abacus/portsentry/
10、 Dsniff
http://naughty.monkey.org/~dugsong/dsniff
11、 Tripwire
http://www.tripwire.com/
12、 Cybercop
http://www.pgp.com/asp_set/products/tns/ccscanner_intro.asp
13、 Hping2
http://www.kyuzz.org/antirez/hping/
14、 SARA
http://www-arc.com/sara/
15、 Sniffit
http://reptile.rug.ac.be/~coder/sniffit/sniffit.html
16、 SATAN
http://www.fish.com/satan/
17、 IPFilter
http://coombs.anu.edu.au/ipfilter
18、 iptables/netfilter/ipchains/ipfwadm
http://netfilter.kernelnotes.org/
19、 Firewalk
http://www.packetfactory.net/Projects/Firewalk/
20、 Strobe
http://www.insecure.org/nmap/index.html#other
21、 L0pht Crack
http://www.l0pht.com/l0phtcrack/
22、 John The Ripper
http://www.openwall.com/john/
23、 Hunt
http://www.cri.cz/kra/index.html#HUNT
24、 OpenSSH / SSH
http://www.openssh.com/
http://www.ssh.com/commerce/index.html
25、 tcp wrappers
ftp://ftp.porcupine.org/pub/security/index.html
26、 Ntop
http://www.ntop.org
27、 traceroute/ping/telnet
http://www.linux.com
28、 NAT (NetBIOS Auditing Tool)
http://www.tux.org/pub/security/secnet/tools/nat10/
29、 scanlogd
http://www.openwall.com/scanlogd/
30、 Sam Spade
http://samspade.org/t/
http://www.samspade.org/
31、 NFR
http://www.nfr.com
32、 logcheck
http://www.psionic.com/abacus/logcheck/
33、 Perl
http://www.perl.org
34、 Ngrep
http://www.packetfactory.net/Projects/ngrep/
35、 Cheops
http://www.marko.net/cheops/
36、 Vetescan
http://www.self-evident.com/
37、 Retina
http://www.eeye.com/html/Products/Retina.html
38、 Libnet
http://www.packetfactory.net/libnet/
39、 Crack / Libcrack
http://www.users.dircon.co.uk/~crypto/
40、 Cerberus Internet Scanner
http://www.cerberus-infosec.co.uk/cis.shtml
41、 Swatch
http://www.stanford.edu/~atkins/swatch/
42、 OpenBSD
http://www.openbsd.org
43、 Nemesis
http://www.packetninja.net/nemesis/
44、 LSOF
ftp://vic.cc.purdue.edu/pub/tools/unix/lsof/
45、 Lids
http://www.turbolinux.com.cn/lids/
46、 IPTraf
http://cebu.mozcom.com/riker/iptraf/
47、 IPLog
http://ojnk.sourceforge.net/
48、 Fragrouter
http://www.anzen.com/research/nidsbench/
49、 Queso
http://www.apostols.org/projectz/queso/
50、 GPG/PGP
http://www.gnupg.org/
http://www.pgp.com
