Looking for a specific sharing button plugin(?)

Hello my friends,

I am looking for a specific plugin (at least I believe it is a plugin). I have seen multiple websites using it including:

<a href=”http://onlinemediamasters.com/yoast-focus-keywords/#
“>http://onlinemediamasters.com/yoast-focus-keywords/#

<a href=”http://dalepartridge.com/
“>http://dalepartridge.com/

<a href=”http://www.seopedia.gr/epilogi-focus-keyword-yoast-plugin/
“>http://www.seopedia.gr/epilogi-focus-keyword-yoast-plugin/

So I believe it should be a plugin or something widely available. Anyone has any idea which one it is or how I can add the same buttons on my wordpress site?

Thank you for your time