URL Director allows you to control and route links to your site that would otherwise resolve with pages not found.

This addon also allows you to create url shortcodes.

here is a url to a page that doesn't exist that is routed to the google maps addon

here it is where it is rendered in place of another url 

Please be sure to visit demo  to see the options for this absolutely awesome add-on :)

To test, simply enter a url that doesn't match a page, visit it, set up a route in the dashboard, save it and click visit :)  It is that easy!