Best Open source /web based sites that are security tools

Clm

Im looking to make a list of the best sites to use for security focused researched and example would be virus total

NOC-Ninja

what do you mean by virus total?

PJ_Sneakers

Virus Total is a site that will scan files/hashes of files with like 50 AV suites. Still not sure what OP wants though.

win2k8

Have you checked out the Security sites sticky post on here:

http://www.techexams.net/forums/off-topic/51719-best-security-websites.html