Wayra Digital

You can show icon and two lines of shipping info static or based on product price.
For example, you can set free shipping on products expensive than $ 500, then in product cheaper than $ 500 you show “Shipping on all country” and if the price is upper $ 500 you show “Free shipping!”.
You can use icon, one text line or two.
It’s possible to select between 4 position in product page: 
* Before product price 
* After product price 
* Before add to cart button 
* After add to cart button
<h3>Translations</h3>
Avialble in this languages: 
* English (default) 
* Spanish (Spanish) 
* Spanish (Argentina) 
* Spanish (Uruguay) 
* Spanish (Chile) 
* Spanish (Perú) 
* Spanish (Venezuela) 
* Spanish (Colombia) 
* Spanish (Costa Rica) 
* Spanish (Guatemala) 
* Spanish (Mexico) 
* Spanish (Puerto Rico)
<h3>Performance</h3>
Clean and very light weight. We love simplicity and efficience.
This plugin no affect your site speed or Google Page Speed result.

Wayra – Free shipping on product details

Show icon and shipping text on products based on product price.

DunfordEnterprises

This plugin provides some basic functionality that I was unable to find with any other plugin.
On checkout, if the user has entered a state in the Continental United States (Lower 48), the only shipping option available is “Free Shipping”.
If the user enters a state that is in the United States, but not in the lower 48, it shows the flat rate.
I created this plugin for use in some of my WooCommerce installations, so it is not editable in the panel. I figured that someone else might find this usefull, so I am throwing it here. If there is a lot of support behind this plugin, I may think about adding some more customizability to it.
Verified working in WooCommerce 2.3.8

WooCommerce – Free Shipping to Lower 48

This plugin sets the shipping method to Free Shipping if the user selects a state in the Continental United States. (Lower 48)

Wayra – Free shipping on product details vs WooCommerce – Free Shipping to Lower 48