See the Wiki for features, implementation notes, and the roadmap.
From a command line:
$ python manager.py
Nethead generates a log file, nethead.log.
Nethead is released under the Mozilla Public License, 2.0. Our intent is that the content of the files we have developed must remain freely available. If you redistribute those files, you must share any changes you have made to them. Please send us your fixes and improvements so everyone benefits!
On the other hand, it's perfectly fine to add proprietary files to Nethead as an application that you redistribute, within the requirements of the license. Give it a read, or see the Wikipedia article to get started.