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joomlaXplorer 
joomlaXplorer is a File- and FTP - Manager. It allows you to edit files, delete, copy, rename, archive and unpack files/directories directly on your server. You can - Browse Directories & Files - Edit, Copy, Move and Delete files - Search, Upload and D ...
AllVideos
*** New version 4 out now, fully compatible with Joomla! 1.5 - 2.5 *** AllVideos (by JoomlaWorks) is truly THE all-in-one media management solution for Joomla! and a classic must-have extension for any Joomla! based website. You can use the plugin t ...
JCE 
An award-winning, configurable WYSIWYG editor for Joomla! based on Moxiecode's TinyMCE. Includes advanced Image/Media, File and Link handling, plugin support, and an Administration interface for editor configuration.
Disable Core Registration
As of version 1.5.3, supports search engine friendly urls (SEF)! Thanks goes to "Schandiwe". FROM NOW ON, this plugin is not only for Community Builder; but also supports other user management components. Read on... Although you unpublish Joomla's ...
jAwards
This component manages medals and lets you hand them out as awards to your users, e.g. if they contribute a certain number of good articles, or display images in the Gallery. You can create medals, hand them out to the users, and display them e.g. in F ...
AJAX Shoutbox
This Joomla module adds live chat functionality to your Joomla site. Your visitors can chat with each other right in your website without refreshing their browsers. It's almost like chatting on an instant messenging network! And it's all powere ...
Personalize
Insert the current user's name or info in content items. Eg. "Hi , welcome back! You're status is ". These tags can be used: , , , , . New features: * Totally rewritten for Joomla! 1.5 * Set default values for guests * Set the date ...
Jx Random Quote
With the new Jx Random Quote v1.2 it is now even easier for the administrator to add new quotes! This new version allows the admin to add quotes in the administrator backend to use in addition to the quote file, or instead of it. There is also a detailed ...