Tor N. Johnson

This plugin enables themes to specify a different single.php template based on post category. As posts can have multiple categories assigned, it uses the following to select which possible custom template to use:
1) Categories directly assigned 
 — Check for extant single-CATEGORYID.php files and prioritize based on category order 
2) Parents of categories 
 — Parents are checked based on category order of the directly assigned categories.
Note, the above assumes that there’s a category order plugin installed. If the categories are NOT in a specific order AND there are multiple categories assigned per post then the template selection will be left up to the server. Naturally, if there is only category assigned per post (or only one possible template per post), then there will be no issue.
<h3>Requirements</h3>

Custom-Single

Enables themes to support custom single.php templates per category in the form single-CATEGORYID.php.

Shashikanta

This Plugin insert a location map in your posts/pages using the iFrame based Google Maps without any Api. 
The user can set the exact coords (latutude or longitudes) or insert the location address. If you want to insert a map in a posts you must to generate two personalized fields (called ‘latitude’ and ‘longitude’) with the coordinates or a personalized field called ‘location’ with the address.
This is good for Real Estate type of Blog as shown in the pics and Custom filed type location. It is very lightweight tested in wordpress 3.3.2 version, custom template ready, Google API free.

Quick Location Maps

This Plugin insert a google map in to your posts using the Google Maps Api Free.

Custom-Single vs Quick Location Maps