This plugin allows you to write posts in more than one language, all you have to 
do is to add some divs to your posts, each div with a class, that is the 
language’s name. This way your readers will be able to just click in the flags 
and change between languages.

WPMultiLanguageChanger

This plugin allows you to write and you readers to change between languages in your blog in a easy way.

Matheus Martins

Artem Platonov

Just add the country from selectbox and fill in preferable options. 
You can specify URL parameters for switching language or domain.
Explanation:
<ul>
<li>
You have a multilingual blog and want your visitors to be directed to the correct language according to their geographical location.
</li>
<li>
You have specific domains or subdomains for different versions of your site and want your visitors to be directed to the right domain accoring to their geographical location.
</li>
</ul>

Geo Redirect

This plugin allows you to redirect your visitors or switch language according to their country.

WPMultiLanguageChanger vs Geo Redirect