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 ia a CiviCRM extension that adds much needed flexibility to scheduled jobs. It accomplishes this goal in two ways......
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Send email notification to event speakers when a new individual registers....
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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 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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org.civicoop.eventprivateical...
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CiviCRM WordPress Member Sync keeps a WordPress user in sync with a CiviCRM membership by granting either a role or capabilities to a WordPress user who has that membership. This enables you to have, among other things, members-only content on your website that is only accessible to current members as defined by the membership types and status rules that you set up in CiviCRM....
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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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Grants access for event creators to view or edit their events' participants.
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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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This extension permits a contact to be changed from one type to another.
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