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:

Allows Smartcivi - to intragrate with your CiviCRM website data.
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This CiviCRM extension automatically creates a Smart Group of Registered Participants to an Event when a New Event is created. Example Use Case...
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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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