nUbuntu is a collection of network and server security testing tools

nubuntu - Network Ubuntu
the liveCD concept is one of the single greatest things to happen to Linux. With a single disc, you can test, work and experiment, free and secure in the knowledge that you can boot back into windows.
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nUbuntu is a collection of network and server security testing tools, piled on top of the existing Ubuntu system. While aimed to be mainly a security testing platform, nUbuntu also operates as a desktop enviroment for the advanced linux user.