Gnucleus was the beginning of a few open-source Gnutella related projects (GWebCache, GnucDNA, GnucNS). Gnucleus itself is a Windows application for accessing the Gnutella and G2 networks. One of the first released after the introduction of Gnutella in 2000 by Nullsoft. It is also the first client to fully support the G2 network, the future of open protocol P2P.

Gnucleus software screenshot