This script will detect the presence of the Alexa Toolbar on Microsoft Windows and Internet Explorer 5.0 or higher. Updated script detects the newer generation of the Alexa Toolbar.
Developer: banbots.com Platform: Date upd:2003-12-01 Hits1742 [Visit]

This script records the date plus time of your visitor's last visit and displays it upon their return. If this is their first visit to your site, a greeting message is shown instead.
Developer: JavaScript Kit Platform: linux, windows Date upd:2006-09-06 Hits725 [Visit]

Use this script to display a table with all the plugins installed on the visitor's computer such as multimedia players, ActiveX, etc.
Developer: javascript.internet.com Platform: Independent Date upd:1999-08-23 Hits5285 [Visit]

This script will allow you to 'grab' the user's IP address. It only works with Java-enabled Netscape browsers.
Developer: javascript.internet.com Platform: Independent Date upd:1999-08-23 Hits11833 [Visit]

Useful for finding out the capability of some HTML-browser to display certain characters defined in the unicode character database. Additionally it can help to find a certain dec/hex value for a specific character by browsing through the unicode sets.
Developer: soldin.de Platform: Mozilla 1.6, Opera 6, IE6 and others Date upd:2004-04-10 Hits1720 [Download] [Visit]