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 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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Extension introduces the InvoiceAddress Get API, getting several invoice addresses for a contact based on valid relationships.
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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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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 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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The CiviMobileAPI extension (com.agiliway.civimobileapi) is a CiviCRM component that allows to use a mobile application CiviMobile.
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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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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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This extension adds tokens for pronouns in Norsk to CiviCRM.
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