Information on the GNU copyright permission statement can be found http://www.gnu.org/licenses/gpl-howto.html.
Information on the GNU project in general can be found at www.gnu.org.
Gin has recently been transferred to savannah because of it's gnu-related nature. It is also currently undergoing a bit of a redesign and rewrite to enable some new features. Hopefully a new release should be out soon then :-)...
In the meantime, you can visit the old page - http://gcpi.sourceforge.net - to obtain earlier versions.
Alex Sisson - email@example.com