BestiaDurmiente

This is a widget based on <a href="http://jungwirths.com/2009/03/simple-wordpress-hit-counter-plugin/" rel="nofollow ugc">Simple Hit Counter</a> 
by pjungwirth. All you have to do is drag the widget to your desired widget container, set up the title, 
text to display and font size and color for the counter and voilà.
It was developed for (and tested in) WordPress MU 1.3

Visit Counter

Widget that prints a count of the number of hits your blog has received, tracked in the database.

sanarena

Hit Sniffer service has shutdown on September 2016 
This plugin now serve as a memorial and soon to be deleted.
Those who look for similiar services, they can use Hit Steps.

Hit Sniffer Live Blog Analytics

Hit Sniffer was a powerful real time website visitor activity tracker.

Visit Counter vs Hit Sniffer Live Blog Analytics