ZopeStudio  
   A management and development environment for the Zope application server.
   http://www.zope.org/Products/ZopeStudio/

XMLterm  
   A command line terminal (like XTerm) with graphical and hyperlink capabilities.
   http://xmlterm.sourceforge.net/

Venkman Project Page  
   JavaScript debugger extension for Mozilla and Netscape browsers.
   http://www.mozilla.org/projects/venkman/

XUL Applications  
   XUL applications/utilities for Mozilla (and Netscape 7). They are based on the specification of Mozilla Nightly Trunk. Works on Netscape 7.0, Mozilla 1.0, Phoenix 0.5, or later.
   http://white.sakura.ne.jp/~piro/xul/xul.html.en

ActiveState Komodo  
   Professional IDE for open source languages, offering support for Perl, PHP, Python, Tcl, and XSLT.
   http://www.activestate.com/komodo

Preferences Toolbar for Mozilla  
   The Preferences Toolbar for Mozilla allows for quick changes of frequently accessed preferences.
   http://www.infotech.tu-chemnitz.de/~knoll/Mozilla/preferences.php

Mozilla Amazon Browser (MAB)  
   A tool for searching and browsing the Amazon database.
   http://mab.mozdev.org

Mozilla XUL Runtime Project  
   Project aiming to create a XUL runtime that requires no browser.
   http://www.mozilla.org/projects/xul/xre.html

ZULU  
   A layout engine for producing rich cross-platform user interfaces, using XUL standard and Flash MX technology.
   http://zulu.netspedition.com/zulu/main/overview.shtml

Link Toolbar  
   An add-on toolbar for mozilla that implements parsing of the <link> element for HTML
   http://segment7.net/projects/mozilla/linktoolbar/