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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Displays a contact’s Job Title with their current employer on the Contact Relationships tab.
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CiviCRM Extension for CiviCRM Contribution and Contact synchronization with QuickBooks Online, http://www.intuit.com.au
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Allows adding an automatically calculated "Additional Percentage" field to any price set (e.g., add 3% to cover credit card fees).
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You can use this CiviCRM extension if you want to create a settings form for your own extension.
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CiviCRM extension to link CiviCRM to the 'Kadervormingstool' of the Flemish government. Work in progress. See the github project page for more info: https://github.com/Chirojeugd-Vlaanderen/kavo...
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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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