Is there a gmail customizing "front end"

[Josef Lowder]

Is there such a thing as a gmail customizing "front end" by which one
could modify the way one sees gmail?

I'd like to be able to get rid of a bunch of what I consider clutter
so as to be able to see a more efficient display of just what I want
to see and not all the extra garbage (at least to me it's garbage).

Here's a screen shot of what I see:
www.upquick.com/view/gmailclutter.jpg

Here are the clutter elements I'd like to eliminate:
www.upquick.com/view/gmailexcess.jpg

This is what it would look like with the clutter removed:
www.upquick.com/view/gmailcleanedup.jpg