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:

Create templates for Contacts and Contributions.
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Adds over 20 new fields to Summary Fields, including contributions by related contacts, plus fields for CiviMail, CiviEvent, and CiviGrant.
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This extension deletes mailings that are unscheduled after a period of days specified.
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Relationship Overview Report This extension creates the CiviCRM report template "Relationship Overview". It allows a condensed, aggregated overview of your contacts' relationships. You can define which relationships are listed; tags can be selected as well. The field then simply lists all the values, separated by a comma....
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This extension provide payment processor with PayLeap payment gateway....
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This extension allows a staff user to add, edit and delete line items of a contribution.
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Report to show activities assigned to the current user...
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A port of the Drupal 'civicrm_og_sync' module for WordPress that enables two-way synchronisation between BuddyPress Groups and 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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Create contributions linked to a membership without extending/renewing a membership.
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org.civicoop.eventprivateical...
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The CiviCase v5 extension is an overhaul of the CiviCase UI. It provides a richer experience with more thoughtful layouts and interactions.
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Extension to facilitate creation of membership, contribution, recurring and subscription records in a multi-step Wizard.
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This CiviCRM extension provides dashlets for atom feeds, because the native CiviCRM blog dashlet only supports rss. (I think.) For the moment it supports only one feed. But I want (at some point) to be able to support multiple feeds. More info on the github project page....
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This function takes a group of contacts, and splits it into several new smaller groups, each with some maximum number of contacts. The original group is left untouched....
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