Free Tools

DNS Tools
http://www.analogx.com/contents/dnsdig.htm
http://www.ip-plus.net/tools/dig_dns_set.en.html
http://www.geektools.com/digtool.php
http://www.dns.net/dnsrd/tools.html

Mail
http://www.abuse.net/

Complete Auditing Tools
http://www.remote-exploit.org/

CI Security Benchmark Tools

CIS Benchmarks/Scoring Tools - Now available, free of charge!
Operating Systems
Benchmark Version Updated
Windows XP Professional SP1/SP2 2.01 09/09/2005
Windows Server 2003 1.2 10/25/2005
Windows 2000 Professional 2.2.1 12/17/2004
Windows 2000 Server 2.2.1 12/17/2004
Windows 2000 1.2.2 02/04/2005
Windows NT 1.05 03/04/2005
Mac OS X 2.0 10/16/2006
FreeBSD 1.0.5 10/21/2005
Solaris 10 2.1.1 03/7/2006
Solaris 2.5.1 - 9.0 1.3 08/11/2004
Red Hat Linux 1.0.5 11/02/2006
SUSE Linux 1.0 03/17/2006
Slackware Linux 1.1 06/16/2006
HP-UX 1.3.1 10/21/2005
AIX 1.01 10/21/2005
Novell OES:NetWare 1.0 08/14/2006
Network Devices
Wireless Networks 1.0 04/14/2005
Cisco IOS Router 2.2 10/15/2003
Cisco PIX 2.2 09/01/2004
Applications
Exchange Server 2003 1.0 08/18/2005
Oracle Database 8i 1.2 04/06/2005
Oracle Database 9i/10g 2.01 08/14/2006
Apache Web Server 1.6 11/13/2006
SQL Server 2000 1.0 12/15/2005
BIND 1.0 01/05/2006
Novell eDirectory 1.0 06/12/2006

CADIA TOOLS

The CAIDA Tools site contains CAIDA tools and software as well as a taxonomy of available research and visualization tools.
-----end summary of contents-----