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 adds a pivot report that suppots multiple CiviCRM entities.
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You like how tags are displayed in the contact summary? this extension does the same, for relationships.    ...
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CallHub is a hosted phone banking service that enables your staff to talk with your contacts over the phone banking campaign and store notes about the call....
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This is a CiviCRM extension designed for "heavy duty" donation receipt generation. Find the user documentation at http://wiki.civicrm.org/confluence/display/CRM/DonationReceipts+Extension Features:...
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SparkPost / CiviCRM Integration Integrates SparkPost to CiviCRM, so email can be sent out over the SparkPost service and bounces can be processed in CiviCRM. * Now processes bounces for Transactional and Bulk (CiviMail) emails....
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The CiviCalendar extension is an CiviCRM component which allows visualizing different types of cases, events and activities.
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This Hebrew Calendar extension for CiviCRM has a variety of functionality,  including mail merge tokens for sending yahrzeit reminders, birthday wishes, Hebrew demographic information, Hebrew date of birth, next Hebrew birthday, yahrzeits, APIs and more....
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Provides several custom searches:   'Fancy Participant Search'  - This search can easily list just the participants who choose "session AAA"  from your priceset options and send them all an email or SMS/Text message.  ...
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A chatbot extension that integrates chat across a variety of platforms (currently Facebook and CiviCRM SMS are implemented) with CiviCRM.
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This extension adds a new url civicrm/a/#/email/unsubscribe with the screen in the screenshot. It is intended to assist in data entry for unsubscribe requests. From the screen find the emails you wish to unsubscribe:  ...
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This extension allows organisations to upload Just Giving Payments into CiviCRM. The end result is that the contributions and donors are all recorded within a single batch which can then be reonciled to the finance system. Installation Guide can be found here...
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CiviCRM natively supports one of three different map markers based on the contact type (Individual, Household, Organization). The Map Pins Extension allows you to replace those markers with custom markers of your own, based on configurable sets of rules depending on contact sub-type, group, tag, or other criteria.  ...
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This extension adds a custom data set to groups and adds a permission (CiviCRM Group Protect) to the CMS (At least it does for Drupal, not sure what it does for other CMS's)....
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Integrates https://telerivet.com/ allowing you to use send and receive SMS with CiviCRM anywhere that you can send and receive SMS using an Android or IOS phone.
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This CiviCRM extension works around the translation issues of CiviCRM 4.7, in particular for Dutch CiviCRM instances....
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