Here you will find a list of the most popular Drupal modules, a short description of what they do, a download link plus how to install instructions. Please keep in mind:

When installing modules make sure you download them from known sources;
Always make backups before you start installing addons. Always!
When downloading a module for Drupal 6.x, 5.x, or 4.7.x, install it on a website that runs respectively Drupal 6.x, 5.x, or 4.7.x, otherwise it will not work correctly.

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This module is mostly used for selling goods and/or services. Some of the features it includes are payment and shipping components, transaction and payment workflow and reports, sales summaries, shipping notifications, donations functionality, etc.

This module allows instant messaging with people that are in each others' buddylists. However, it could be used only with the latest Drupal version - Drupal 4.7

This module allows you to create a site guestbook as well as individual user guestbooks, also assign an intro text on every guestbook, define text message format, and much more.

With Drupal Gallery you can integrate Gallery2 to your Drupal website. With the Gallery module you can add photos and videos to your web pages. Please note that before installing this module you should first download and install Gallery2 on your hosting account.

Drupal Event helps you to keep track of certain events. In the same time is provides API in order to allow other modules already installed to work with the saved data.

Views is a Drupal module that provides designers a flexible control opportunity on how lists of content (traditionally hard-coded elements) are presented. Using this Drupal module you can sort the default front page view and the default taxonomy/term view differently, you can restrict /tracker to posts of a certain type, you can provide "unread forum posts", and a lot more.

With the Content Construction Kit (CCK) you can create and customize fields using a web browser. In Drupal 5.x CCK allows you to create custom content types in core and add custom fields to any content type.

Using the Content Template module you can modificate the Drupal teaser and body fields before they go out in an RSS feed, search index, or are handed off to the theme. The templates are stored in the database but it is also possible to create disk-based templates which are stored in your sites directory and can be inherited across multisite installations in the same way as themes or modules.

Drupal Five Star is a voting module that adds a clean, attractive voting widget to nodes in Drupal 5 and 6. Some of its features are jQuery rollover effects and AJAX no-reload voting, configurable star sets, graceful degradation to an HTML rating form when JavaScript is turned off, support for anonymous voters, spam protection to keep users from filling your DB with bogus votes, etc.

With the Login Toboggan module you can modificate the login system of your Drupal website. It allows users to login using either their username or their e-mail address. Users can define their own password and can login immediately. You can customize the registration form with two e-mail fields to ensure accuracy. Optionally you can redirect the user to a specific page when using the "immediate login" feature, or to a specific page upon validation of their e-mail address.

With Imagecache you will be able to setup presets for image processing. In case an ImageCache derivative doesn't exist the web server's rewrite rules will pass the request to Drupal. Drupal hands it off to imagecache to dynamically generate the file.

Devel is a helper tool for Drupal developers and inquisitive admins. With this module you can have a summary of all database queries for each page request printed at the bottom of each page. The summary includes how many times each query was executed on a page, and how long each query took.

With Pathauto you can automatically generate path aliases for nodes, categories, users, and other kinds of content. This modules does not require to manually specify the path alias. It creates aliases like /category/my-node-title.html instead of /node/123. The aliases are based upon a "pattern" system which the administrator can control.

For advanced editing of your Drupal site content use TinyMCE WYSIWYG Editor. This Drupal module integrates Moxiecode's popular TinyMCE WYSIWYG editor into any Drupal site. Since its installation is not easy, less technical Drupal 5 users should consider using the TinyMCE Automatic Configuration module.