Windows Internet security test (in German)
http://www.kgojani.ch/check.htm

Port Authority Edition – Internet Vulnerability Profiling
https://www.grc.com/x/ne.dll?bh0bkyd2

Internet survival history
The survivaltime is calculated as the average time between reports for an average target IP address. If you are assuming that most of these reports are generated by worms that attempt to propagate, an unpatched system would be infected by such a probe.
http://isc.sans.org/survivalhistory.php

"Windows XP Surviving the first day"
http://www.sans.org/rr/whitepapers/windows/1298.php

Password recovery software:
Windows 2000, Win NT, MS Office, Instant messaging (MSN)
http://www.elcomsoft.com/prs.html

ZIP-file password cracker:
http://www.elcomsoft.com/archpr.html

MS Tool for removing "hidden data" in Office files:
http://www.microsoft.com/downloads/details.aspx?displaylang=de&familyID=144e54ed-d43e-42ca-bc7b-5446d34e5360 (german version)
http://www.microsoft.com/downloads/details.aspx?displaylang=en&familyID=144e54ed-d43e-42ca-bc7b-5446d34e5360 (english version)

File recovery for all media (Harddisks, smartcard, etc.)
http://www.pcinspector.de/
http://www.r-undelete.com/?HEIde001

Tool for safely erasing data:
http://www.tolvanen.com/eraser/

Hints: Ins internet - mit sicherheit (German text)
http://www.bsi-fuer-buerger.de/

DU Meter is an award winning utility from Hagel Technologies that provides an accurate account of the data which is flowing through your computer's network connection at any given moment.
www.dumeter.com