Bonny85

LB Users Counter is a plugin for WordPress. Allows you to add a widget to a sidebar, where you can view some attributes with respect to the number of users browsing the website (online, offline and online user name).
API Reference
User Class
This class contains the static methods for get info of users login
<ul>
<li>
User::getUserOff() This function get number of users offline.
</li>
<li>
User::getUserOn() This function get number of users online.
</li>
<li>
User::getNameUserOn() This function get the names of users online.
</li>
</ul>
<a href="http://www.lucabonaldo.it/lb-users-counter/" rel="nofollow ugc">Documentation in Italian</a>

LB Users Counter

Allows you to add a widget to a sidebar, where you can view some attributes with respect to the number of users browsing the website.

osama.esh

a simple tool to know your post statistics (With GEO locations)
Single Post Statistics includes: 
<ul>
<li>Comprehensive overview page (Dashboard), including country stats, cities, visitors, visits</li>
<li>compatible with any post type</li>
<li>Visits & Visitors, see how many hits your site get in any period</li>
<li>see how many people are viewing your site posts by weekly statistics</li>
<li>GEO locations</li>
</ul>

WP Post Statistics (Visitors & Visits Counter)

Very clear and Useful

a simple tool to know your post statistics

LB Users Counter vs WP Post Statistics (Visitors & Visits Counter)