Donncha O Caoimh (a11n)

Use the cookie left after someone leaves a comment to identify their future visits to your blog.

Blog Voyeur

Log by name where and when users visit your blog.

Max Chirkov

Simple log of user logins. Tracks user name, time of login, IP address and browser user agent.
<a href="http://screenr.com/kfEs" title="Demo Video" rel="nofollow ugc">Demo Video</a>
Features include:
<ol>
<li>ability to filter by user name, successful/failed logins, month and year;</li>
<li>export into CSV file;</li>
<li>log auto-truncation;</li>
<li>option to record failed login attempts.</li>
</ol>
Translations:
<ul>
<li>Persian [fa_IR] by <a href="http://taktaweb.ir/" rel="nofollow ugc">MohammadHadi Nasiri</a></li>
<li>German [de_DE] by Philipp Moore</li>
<li>Russian [ru_RU]</li>
<li>Ukrainian [ua_UA]</li>
<li>Chinese [zh_CN] by <a href="http://www.mihuwa.com/" rel="nofollow ugc">Mihuwa</a></li>
<li>
French [fr_FR] by <a href="http://www.lo-geek.fr/" rel="nofollow ugc">Mehdi Hamida</a>
</li>
<li>
Author: Max Chirkov
</li>
<li>Author URI: <a href="http://simplerealtytheme.com/" title="Real Estate Themes & Plugins for WordPress" rel="nofollow ugc">http://simplerealtytheme.com/</a></li>
<li>Copyright: Released under GNU GENERAL PUBLIC LICENSE</li>
</ul>
<h4>Filters</h4>
** Log Output Within the Table **
sll-output-data – filters table row array where array keys are column names and values is the output 
For example, we can use this filter to link IP addresses to a geo-location service:
<pre><code><?php
add_filter( 'sll-output-data', 'link_location_by_ip' );
function link_location_by_ip($item){

 //$item is a single row for columns with their values

 $item['ip'] = sprintf('<a target="_blank" href="http://infosniper.net/index.php?ip_address=%1$s&map_source=3&two_maps=1&overview_map=1&lang=1&map_type=1&zoom_level=11">%1$s</a>', $item['ip']);
 return $item;
}
?>
</code></pre>
<h4>Translation</h4>
If you would like to contribute, the POT file is available in the languages folder. Translation file name convention is sll-{locale}.mo, where {locale} is the locale of your language. Fore example, Russian file name would be sll-ru_RU.po.

Simple Login Log

Хороший плагин и полезный

Simple login log

This plugin keeps a log of WordPress user logins. Offers user and date filtering, and export features.

Blog Voyeur vs Simple Login Log