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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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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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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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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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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