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 to find and export payment(s) for contribution(s).
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CiviCRM Extension to support you with creating and maintaining households. It is currently under development, so feel free to contact us for the bits that are still missing - or simply contribute the implementations. The extension allows you to choose on of three household modes:...
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This extension provide payment processor with PayLeap payment gateway....
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This is a simple extension that collapses both the communication preferences and demographics sections by default on the summary page.
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Dummy SMS provider for CiviCRM. Useful to testing SMS functionality and integration.
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Create, configure and manage any number recurring tasks with this neat little extension - BUT: you have to know your way around SQL.
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With this extension you can export financial batches to CSV-documents, that can be imported into Winbooks using the infamous WbLink tool....
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Restrict users from viewing/editing contributions and other entities based on permission of financial types.
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This Extension uses the jquery plugin Slicknav to make the CiviCRM administration menu web responsive. Currently there is one breakpoint at 50em at which point the menu changes from a bar across the top to a hamburger style dropdown menu so that CiviCRM users can more easily navigate thru CiviCRM on small screens (tablets, phones etc.).  ...
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This plugin integrates the Joomla and/or Community Builder registration process with CiviCRM....
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This extension gives the administrator the possibility to define geogrpahical areas. Each contact is assigned the areas based on his address
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Drush module to automatically setup Drupal instances with CiviCRM using Aegir. https://www.drupal.org/project/hosting_civicrm...
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Geocoder extension provides geocoding from multiple providers (default is Open Street Maps) with advanced features over core geocoding Requires - CiviCRM 5.x, php 5.6 Credit : the Wikimedia Foundation
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Extension with Belgian magic....
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