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:

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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Includes a number of custom searches that help give an overview of financial information.  Useful for financial and bookkeeping staff of an organization.   Custom searches include:   Engagement Summary Contact Financial Summary Contact Financial Exclusion Summary ...
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This CiviCRM extension normalizes your data before it is saved to the database. It therefore works from the back-end, with public form submissions such as profiles, contribution, event registration and membership creation/renewal pages as well as with data imports. It can normalize first, middle, last and company names, phone numbers, and addresses including zip codes....
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Maintains a log of API calls made through the REST interface
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The Petition Email CiviCRM extension allows you to automatically trigger an email everytime someone signs a petition. The email can go to one or more static targets or you can do a dynamic lookup of targets by matching the value of a field in the petition signer's contact with a value in a target group's contact....
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