There is a nice collection of tools at www.iwebtool.com, specifically at http://www.iwebtool.com/tools/. It’s more than just how google sees your site, there are tools that show how your page ranks at alexa, etc.
http://www.iwebtool.com/visual_pagerank for instance is the Visual Pagerank tool and http://www.iwebtool.com/pagerank_prediction is the google pagerank prediction tool.