Google Maps to OSM

Using PHP

Google Maps URL :

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OSM URL: http://openstreetmap.org/?lat=0&lon=0&zoom=2

As a bookmarklet using Javascript

The same action as bookmarklet. Do not click on this link! Add it to your bookmark: Google Maps to OSM bookmarklet
Then chose a map on Google Maps. Select the just added entry in your bookmark and now you obtain the same map in Open Street Map. :-)

Source code for this page