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:

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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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 causes the "county" field on addresses to automatically be populated when an address is created or updated....
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The CiviCRM WordPress Profile Sync plugin keeps the "First Name", "Last Name", "Email Address" and "Website" fields of a WordPress (and BuddyPress) user profile in sync with the corresponding fields of a CiviCRM contact. The synchronisation takes place regardless of whether the changes are made in WordPress, BuddyPress or CiviCRM....
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Part of the Sunlight Congressional Districts module.  Provides a way to automatically get congressional district information about your contacts into CiviCRM using the Sunlight Congress API....
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Get your work done in fewer clicks! Speed up your most tedious CiviCRM workflows by adding custom action links to your search results.
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This extension allow to restrict sending emails using "Site From Email Address" to allowed user/roles. The permission that enables this functionality is 'site from email address'. Important This extension overrides the following core 4.6.8/4.6.11 CiviCRM files:...
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Extension to support General Data Protection Regulation
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Overview This CiviCRM extension provides some event related report templates. See the README file for detailed information....
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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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