There have been several reports and discussions that Google is no longer downloading the linux client for gizmo5.
http://linux.slashdot.org/article.pl?sid=09/11/28/2332254

There seems to be a link for linux on the gizmo download page.
http://gizmo5.com/pc/download/
Following that link seems to result in downloading the windows client rather than the linux client.
http://gizmo5.com/pc/download/linux

The directory containing various downloads still has a variety of linux files. There are several releases for a variety of hardware.
http://download.gizmo5.com/jasmine/