There are plenty of Drupal Modules that you can install for your site as add-ons. What we liked best about Drupal modules is that it already comes pre-shipped with several ble module modules. So a standard distribution contains several useful modules that you can simple point, click and enable.
Some examples of such pre-shipped modules are: archive that displays a calendar
to navigate old content, book which allows users to collaboratively author a book,
forums for threaded discussions about general topics, paths that enable renaming
URLs for search engines, polls to capture votes on different topics in the form of
multiple choice questions, and much more.
You can also download many user contributed modules from the Drupal site that are
not pre-shipped in the standard distribution. You can see the full list of modules at:
. Here are some modules that we found
API: This is an implementation of a subset of the Doxygen documentation generator
specification, tuned to produce output that best benefits the Drupal code base. This
module was designed to produce the Drupal developer documentation available at
Banner: The banner.module allows you to display ads on your Drupal website. It
randomly displays the banners, and automatically tracks how many times each is
displayed and clicked. Users of your website can be given ownership of banners,
and be allowed to modify certain settings and view statistics. Supports numerous
graphic formats, flash animations, and text.
Database Administration: The dba module provides Drupal administrators with
direct access to their Drupal database tables from within the standard Drupal user
interface. It is possible to execute scripts to create and alter tables, to backup one
or more tables, to view/edit/delete data within tables, and to emtpy or drop tables.
If using MySQL, it is also possible to check and repair tables.