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:

Extended membership report with support of filtering/showing custom fields of Individual contact.
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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 allows users to get their CiviCRM assigned activities into their Google Calendar or similar calendaring applications, by providing a feed of each user's assigned activities in iCalendar format, ready to be subscribed to from within Google Calendar, Outlook, etc....
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The DefaultDashlets CiviCRM extension creates a settings page that allows administrators to define the active dashlets for new users based on group membership. Usage Enable the extension and visit /civicrm/admin/defaultdashlets (Administer > Default Dashlets) to set default dashlets by group....
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Sets opt out flag when people are marked as deceased. On install deceased existing contacts will be opted out. Note that most CiviCRM processes take the is_deceased flag into account so this is likely to be of use only if you have specific data processes that benefit from it...
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The native CiviCRM extension ContactSegment has been funded by PUM Senior Experts (https://www.pum.nl) and developed by CiviCooP (https://www.civicoop.org/). It is an open source extension and available for the general public under the AGPL-3.0 license....
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Automate SMS conversations with contacts in CiviCRM.
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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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A simple email reader, targeted for developers, when they have activated the 'Redirect to Database' option. Useful for debugging.
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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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This CiviCRM extension provides a daily scheduled job named "Call Email2Each.Sendemails API (Daily)"  This job expects 2 parameters: a group name and a message template name.  When this job runs,  it will send an email to each contact in the group/smart group. The contents of the email will be the message template. ...
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processor plugin but no longer recommended
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When viewing reports, clicking on a contact's name brings you to the contact's record, not their Contact Detail Report or Contribution Detail Report....
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