Darknet has a great list of tools that you might use if you were trying to check the vulnerability of your computer or a friend's computer that gave you permission. Darknet is a great resource if you are at all interested in hacking. Their...
There actually are quite a few creditable 'crack' sites that won't try to bombard you with full-screen popup ads, or commandeer your computer into a spam-loving Kraken or Srizbi Botnet army.
www.filesharefreak.com/2008/07/30/crackkeygen-sites-that-are-safe-to-use/
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HackThisSite! is a legal and safe network security resource where users test their hacking skills on various challenges and learn about hacking and network security. Also provided are articles, comprehensive and active forums, and guides an...
A fast password cracker for Unix, Windows, DOS, BeOS, and OpenVMS, with support for Unix, Windows, and Kerberos AFS passwords, plus a lot more with contributed patches