Flow Byte

This plugin will let you add google map as a shortcode to your website. 
It lets you create maps of two types. 
1 – Customizable Google Map, which requires API key from google. 
2 – A free embedded iframe google map.
The plugin is made to be as simple, as possible to make it easy for beginner users.
When you create a map, plugin will generate a shortcode, which you can then place on any page, post or a custom post type.

Smooth Maps

This plugin will let you add google map as a shortcode to your website.

John Godley

PageView is a plugin that will display another web page inside the current post. This is achieved with the use of an 
iframe – an HTML tag that allows a webpage to be displayed inline with the current page.
To use:
<pre><code>[pageview url="http://urbangiraffe.com"]
</code></pre>
Optional arguments:
title = A title to show under the iframe 
desc = A description to show under the iframe 
width = Width of iframe, in px or % 
height = Height of iframe, in px or %
<h3>Documentation</h3>
Full documentation can be found on the <a href="http://urbangiraffe.com/plugins/pageview/" rel="nofollow ugc">Pageview</a> page.

PageView

Insert an iframe and display an external website directly in a post using just a shortcode.

Smooth Maps vs PageView