Roger MacRae

A customizable login widget that will allow you to add a welcome message, the users avatar, custom links, and cubepoints integration. 
A few features: 
* Add welcome message 
* Add custom links. 
* Add userlevel specific links. 
* Show user avatar. 
* Style every aspect using CSS 
* And there is so much more to come in future releases.

Custom Login Widget With Cube Points Integration

A customizable login widget that will allow you to add a welcome message, the users avatar, custom links, and cubepoints integration.

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.

Custom Login Widget With Cube Points Integration vs LB Users Counter