Extensions
Editors
Editors are used thoughout Joomla! where content is created. TinyMCE is the default choice in most locations although CodeMirror is used in the template manager. No Editor provides a text box for html content.
Default on:
- CodeMirror Help
- TinyMCE Help
- No Editor Help
Default off:
- None
Feed Display
This module allows the displaying of a syndicated feed. Help
Language Switcher
The language switcher module allows you to take advantage of the language tags that are available when content, modules and menu links are created.
This module displays a list of available Content Languages for switching between them.
When switching languages, it redirects to the Home page defined for the chosen language. Thereafter, the navigation will be the one defined for that language.
The language filter plugin must be enabled for this module to work properly.
To view an example of the language switch moduler module, go to the site administrator and enable the language filter plugin and the language switcher module labellled "language switcher" and visit the fruit shop or park sample sites. Then follow the instructions in this tutorial.
Subcategories
Components
Components are larger extensions that produce the major content for your site. Each component has one or more "views" that control how content is displayed.In the Joomla! administrator there are additional extensions suce as Menus, Redirection, and the extension managers.
Modules
Modules are small blocks of content that can be displayed in positions on a web page. The menus on this site are displayed in modules. The core of Joomla! includes 17 separate modules ranging from login to search to random images. Each module has a name that starts mod_ but when it displays it has a title. In the descriptions in this section, the titles are the same as the names.
Templates give your site its look and feel. They determine layout, colors, type faces, graphics and other aspects of design that make your site unique. Your installation of Joomla comes prepackaged with four templates. 
Plugins are small task oriented extensions that enhance the Joomla! framework. Some are associated with particular extensions and others, such as editors, are used across all of Joomla!. Most beginning users do not need to change any of the plugins that install with Joomla!. Easy to Start
Tutorials and Online Training create for the analyzers & students involve into the ATLAS Experiment
Monitoring Tools of ATLAS Napoli Team
In addition ATLAS Napoli team develops tools to monitoring differnet aspects of the ATLAS experiment.