wojciechborowicz

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.

Jackson Whelan

Allows you to paste iframe codes in the visual editor, just enclose within the [iframe][/iframe] shortcode.

iframe Shortcode

Paste iframe embed codes into the visual editor.

Smooth Maps vs iframe Shortcode