gPhoto is an universal, free GTK+ application that will allow
downloading, saving, and manipulation of images from several
different digital camera models, or from the local harddrive.

gPhoto has a basic command line interface, which is handy,
if you want to set up a web camera, and use gphoto in a
script, e.g. with Perl/PHP. 

gPhoto sports a new HTML engine, that let's you create your
gallery "themes" (HTML with special tags), and publish images
to the web.  A directory browse mode has also been implemented.

gPhoto supports a wide array of digital camera models. 
Visit http://www.gphoto.org/cameras.html for an updated list.