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 provides fieldset on new contact form for adding relationship(s).
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This CiviCRM extension adds some contribution related functionality that I find useful for our CiviCRM instance....
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When CiviCRM geocodes an address, the geocoding service generally returns much more information than CiviCRM uses. This extension allows site administrators to set a policy for what to do with that information on a field-by-field basis: discard it, fill in missing data, or overwrite existing data....
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If you theme is already based on boostrap, civisualize works fine out of the box. If you don't, enable this extension that will add the missing stylesheets so the default datavisualisations look better...
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The Campaign Manager takes working with CiviCRM's campaigns to the next level. You'll love the new stats,KPIs, and hierarchies of campaigns.
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This is a simple CiviCRM report giving you a list of the upcoming birthdays of your contacts. Simply install the extension, create a new report, and use "Available for Dashboard" to give you the list upon login....
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This extension protects the use of a personal from address in the Send E-mail takas (after search). It does not protect the use of personal from address in CiviMail (Mass mailings)....
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Backport of FontAwesome so it can be used in CiviCRM < 4.7. Useful if your extension uses fontawesome icons. http://fontawesome.io https://wiki.civicrm.org/confluence/display/CRMDOC/Icons ...
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Online Worldpay Payment Processor using API to generate tokens and authorise payment. Once installed just set-up the payment processor and this will be available for using in CiviCRM...
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This extension has been developed for the test purpose only....
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Extended membership report with support of filtering/showing custom fields of Individual contact.
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This extension adds a new API to CiviCRM: Entity is FinancialItem, action is Get. You can also use the derived actions getsingle, getvalue, getcount etc....
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Provides functions to look up address meta-data from Postcodes.io: admin district, geolocation, and county.
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GoCardless Payment Processor for CiviCRM...
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Provides extra tools to assist organizations with a lot of families, households, and couples in their CiviCRM database.   Current features include family/spouse information at a glance when viewing a contact record.   For example:  ...
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