Joomla extensions are designed to be integrated in your Joomla application in order to extend its functionality. Joomla 1.5 extensions include components, modules and plugins, as well as language packs and templates.
Here you will find a list of the most popular Joomla extensions, a short description of what they do, a download link plus how to install instructions. Please remember:

When installing extensions make sure you download them from known sources;
Always make backups of your Joomla site before you start installing extensions. Always!

You can find a large selection of Joomla Extensions at Joomla.org. Below we have selected only the most popular addons.

To install Extensions in Joomla please login to your Joomla 1.5 administrator backend, choose menu Extensions -> Install/Uninstall and simply browse and upload the extension you've chosen.

If you wish to manage the installed extensions it is important to be able to identify the extension as a component, module or plugin.

Joomla Components add functionality to the Joomla system itself - e.g. site optimization, content backup, content translation. This functionality cannot be noticed directly, but help ordering and customizing your website.
Joomla Modules are used as a bridge between the Component and Joomla: you need a Module to enable a chosen Component.
Joomla Plugins (a.k.a. Mambots) are add-ons that perform a specific function when triggered without being displayed before your visitors. They can range from text-replacing to something as complicated as a template-management system. E.g. WYSIWYG editors are Plugins.

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Magento is the latest open source eCommerce platform. It offers professional features, flexibility and control over the look, content, and functionality of the online shop. Magento has an intuitive administration interface, is completely scalable and backed by an extensive support network. Using JFusion it is now possible to integrate this great eCommerce platform in Joomla 1.5. JFusion is a free GPL plugin which provides universal user integration, by extending the Joomla 1.5 user authentication framework without any core hacks. Free Download.

Important Note: There is NO support for Joomla 1.0.x, as JFusion is dependent on the beautiful Joomla 1.5 framework. JFusion is an alpha release product, released for testing purposes and should not be used on production sites.

JEvents (or Events Calendar) consists of a JoomFish compatible Joomla component and a number of modules and plugins. Collectively you can create one-off or repeating events under various events categories. With JEvents you get an attractive looking and customizable calendar. Free Download.

RSGallery2 is THE gallery solution for your images. This component brings you cool templates, image management, access control and it supports 35 languages. Free Download.

phpBB3, SMF 1.1.4, vBulletin 3.6.8, MyBB and IPB are further very useful forum scripts that can be integrated and work excellent with Joomla 1.5. To do that the webmaster should simply download and install JFusion. JFusion is a free GPL plugin which provides universal user integration of the forum scripts mentioned above, by extending the Joomla 1.5 user authentication framework without any core hacks. Free Download.

Important Note: There is NO support for Joomla 1.0.x, as JFusion is dependent on the beautiful Joomla 1.5 framework. JFusion is an alpha release product, released for testing purposes and should not be used on production sites.

This Plugin for YouTube Videos enables you to display YouTube Videos in your articles. The user can customize the appearance and functionality of the YouTube Flash player through various parameters. There is support for single videos, playlists and custom players. English, German and Norwegian are supported. Free Download.

Jobline enables you to post job and internship offers on your site. Every job opening needs to be approved by admin before publishing. Users can browse all vacancies and apply online. The component supports multiple languages and several different sets of templates. Free Download.

RSform!Pro is a Professional Form Management extension for Joomla. You can use RSform!Pro for adding, removing, publishing, ordering and easily editing form fields in your web site and emails. It offers auto-generated layouts with multiple options for you to choose from. RSform!Pro has a lot of great features and doesn't require any programming knowledge. Price: $21.99.

If you want to optimize your articles for the web without hacking your Joomla! core, this easy to use plugin will be just the right for you. Alias for PageTitle Plugin (SEO without core hack) enables you to replace the title tag with the article alias, instead of using the regular article title. This will bring you much more visitors, who will spread the word about your website. Free Download.

DOCman is a component for Mambo and Joomla CMS which will help you manage documents and downloads. You can arrange them in multiple categories and subcategories and make them available for download on a Mambo/Joomla powered web site. Free Download.

With pollXT you can easily add and customize polls at your website. The component offers many additional features to the standard Joomla! poll, which allows you to create highly configurable polls with unlimited questions and unlimited different types of answers. Furthermore there is a highly configurable results display option in the main window, module or separate window, graphical display using JPGRAPH etc. PollXT has an easy to use administration interface and security features. Free Download.