alexhal

The Shop Ajax tags dropdown allows customers to sort products based on tags instead of variations. For example: 
Show all products with tag “Tshirt” or show all products with tag “Jumper” and “Jersey”.
This plugin still needs some development, but if you just need a basic AJAX tag widget it will do. 
We hope to release and updated version in a couple of weeks which works better.
This plugin is compatible with WordPress 4.0 and WooCommerce 2.2.0-bleeding.

Shop Ajax Tags Dropdown

This plugin adds an AJAX tag Dropdown widget to your WooCommerce shop.

andreyk

To use the WP Country plugin in your theme or plugin add <code>global $wp_country;</code> into your theme or plugin PHP file, 
then:
<ul>
<li>
<code>$wp_country->countries_list()</code> is an array of country names
</li>
<li>
<code>$wp_country->dropdown()</code> prints or returns countries as dropdown HTML tag.
</li>
<li>
<code>$wp_country->name($alpha2)</code> returns the name of a country by it’s 2-character code.
</li>
</ul>
Russian translation is available now.

WP Country

Provides WP_Country PHP class to get countries list as an array and dropdown country select for use in other plugins and themes.

Shop Ajax Tags Dropdown vs WP Country