Extensions are installable packages which give CiviCRM new functionality, and this directory provides a centralized list of extensions which the CiviCRM community has created.

Further resources:

Restrict users from viewing/editing contributions and other entities based on permission of financial types.
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This Extension uses the jquery plugin Slicknav to make the CiviCRM administration menu web responsive. Currently there is one breakpoint at 50em at which point the menu changes from a bar across the top to a hamburger style dropdown menu so that CiviCRM users can more easily navigate thru CiviCRM on small screens (tablets, phones etc.).  ...
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This plugin integrates the Joomla and/or Community Builder registration process with CiviCRM....
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This extension gives the administrator the possibility to define geogrpahical areas. Each contact is assigned the areas based on his address
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Dummy SMS provider for CiviCRM. Useful to testing SMS functionality and integration.
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Create, configure and manage any number recurring tasks with this neat little extension - BUT: you have to know your way around SQL.
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With this extension you can export financial batches to CSV-documents, that can be imported into Winbooks using the infamous WbLink tool....
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CiviREBUX is a native CiviCRM extension for drafting custom Contribution and Membership reports via a drag-n-drop interface. CiviREBUX combines powerful visualization and transformation techniques which gives users full capabilities of modern b...
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This extension gives you the ability to relate the donor and the honoree on a contribution page.
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This extensions shows a new field on the contact summary tab which shows either the first activity of  the contact or the first group membership.    ...
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Drush module to automatically setup Drupal instances with CiviCRM using Aegir. https://www.drupal.org/project/hosting_civicrm...
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Extension with Belgian magic....
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View and respond to inbound SMS messages. To view, click on Mailings then SMS Inbox.
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When viewing Contact Summary page Contributions tab, displays the balance due for each row on the list of contribution.
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