The latest version of nmap was released earlier this month, and if you haven’t already downloaded it, get on it, it has some awesome new features.
Probably the most interesting of the new features is the web spidering feature.
To improve the user experience, the Windows installer now installs various browser toolbars, search engine redirectors, and associated adware.
Feature breakdown:
Mac OS X packages are now x86-only (rather than universal), reducing the download size from 30 MB to about 17.
Change Log can be found here and Download Here .
Alternatively add your repository into backtrack and do an apt-get install nmap.