Turning this into a tool?

As I suggested here: http://wordpress.org/support/topic/possible-to-make-this-a-tool-for-users?replies=1#post-4312693

I would want to use a plugin which makes it possible for the end user to type into a input field the url of the site and get the pagerank, alexa rank or whatever!

Like this plugin does more or less:

http://wordpress.org/plugins/lw-website-tools/

http://wordpress.org/extend/plugins/list-rank-dashboard-widget/