http://gtk-gnutella.sourceforge.net/de/?page=devel - An
implementation in C, GPL, *nix and Windows
http://gnucleus.com/GnucDNA/ - Written with Microsoft Visual Studio
7.0, LGPL, Windows
http://shareaza.sourceforge.net/ - Written with Microsoft Visual
Studio, GPL, Windows
http://limewire.org - Written in Java, GPL, Windows, MacOSX, *nix
http://phex.org - Written in Java, GPL, Windows, MacOSX, *nix

For coding: http://the-gdf.org - Gnutella-Specs

And for the basics: http://gnufu.net - the changes in Gnutella in
userfriendly-format, GFDL

Best Wishes,
Arne
PS: I hope I didn't forget one.

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