Hi OldDeath, GnucDNA's development ceased a long time ago, but it's still available at SourceForge and in fact it just works fine. It is indeed open source, under GNU LGPL IIRC (you can include it in proprietary applications, as long as you release the source code of the modified version of GnucDNA, not the whole application). Actually GnucDNA is part of the Gnucleus project and is designed to be the network core of Gnucleus and other applications as well. You can get the latest version along with its source code from Gnucleus HTH in some way.

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Shareaza[dot]com was hijacked and now distributes an application pretending to be ShareazaV5. In fact, ShareazaV4 and V5 are relooked clones of BearShare and iMesh and connect to their centralized and filtered network. They are totally unrelated to the genuine, open source Shareaza which moved to http://shareaza.sourceforge.net/