Google Maps: Map Type (Roadmap, Terrain)

I just came across the following web site and noticed they had 2 map types I'm not certain on how to activitate from the Google Maps JavaScript API.

ht开发者_开发知识库tp://www.maps-for-free.com/index.html

It's the "Relief" and "OSM" Map Type as found on the link above.

Any ideas what the API call is to display "Relief" and "OSM" from a Google Map?

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This is not a standard Google Maps API map, it is a layer added by the website. There are relief layers out there you can download and implement yourself actually the website you showed is offering this service.

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Look at the top of the link you provided, you will find Tutorial (Mashup-Example) - Downloads

Open these links and you will see how stuff works.