Shareaza is a file sharing system. It can harness the power of up to four separate peer-to-peer (P2P) networks, including eDonkey2000, Gnutella, BitTorrent and Shareaza's native network, Gnutella2 (G2).
Not only that, but Shareaza is completely FREE and won't show any annoying ads or pop-ups. It won't install any unwanted third party programs that can wreak havoc with your computer. No spyware, no registration, no "paid version". Just download and use. Simple.