rafallach

Plugin creates language selector widget with country flags for the Stella plugin. 
Plugin can be easly styled by css attached to your wordpress template.
<h3>Source</h3>
Mecrucrial Repository: https://rafallach@bitbucket.org/rafallach/stella-flags-plugin

Stella Flags Widget

Plugin creates language selector widget with country flags for the Stella plugin.

julienvdg

hreflang Flag plugin uses <a href="http://www.w3.org/TR/css3-selectors/#attribute-selectors" title="W3C CSS3 Attribute selectors description" rel="nofollow ugc">css3 selectors</a> to add a flag icon to your links depending on their <a href="http://www.w3.org/TR/html401/struct/links.html#adef-hreflang" title="hreflang attribute description on W3C" rel="nofollow ugc">hreflang attribute</a>.
This is really useful if you regularly link to pages in other languages and you want to inform your visitors about the language of the link target.
It’s even more useful if your own blog is multilingual.

hreflang Flag

Add a flag icon to link corresponding to the hreflang attribute.

Stella Flags Widget vs hreflang Flag