As the name suggests this tool is for instantly cracking the Microsoft Windows NT Hash (MD4) when the LM Password is already known, you might be familiar with LM Cracking tools such as LCP.
Execution time : < 2 seconds to crack more than 1200 NT Hashes.
Download lm2ntcrack :
http://www.xmcopartners.com/lm2ntcrack/lm2ntcrack-current.tgz
More Info :
http://www.xmcopartners.com/lm2ntcrack/index.html