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 provide payment processor with PayLeap payment gateway....
Current Usage: 0
This plugin integrates the Joomla and/or Community Builder registration process with CiviCRM....
Current Usage: 0
Get your supporters chassé-ing through automated email-driven journeys to improve onboarding experience and supporter development.
Current Usage: 0
Sunlight Congressional Districts - Fetches data about the current members of Congress using the Sunlight Congress API. http://services.sunlightlabs.com/docs/Sunlight_Congress_API/...
Current Usage: 0
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....
Current Usage: 0
View and respond to inbound SMS messages. To view, click on Mailings then SMS Inbox.
Current Usage: 0
This extension gives you the ability to relate the donor and the honoree on a contribution page.
Current Usage: 0
Allows you to map RSForm fields to CiviCRM contact fields.
Current Usage: 0
This is a CiviCRM CMS independent extension for creating and managing embeddable widgets which can showcase content from various CiviCRM properties like Donate links to contribution pages, Contribution status as progress bar, Mailinglist signup forms, html text etc. The Widget Creation Interface (WCI) offer the flexibility to CiviCRM users to customize the look and feel of the widgets....
Current Usage: 0
 ...
Current Usage: 0
Use this extension to export your financial batches to Microsoft Great Plains.
Current Usage: 0
Allows Zaakpay payment processor to be used with the civicrm. More info at Extension page on github...
Current Usage: 0
The Drupal core contact module provides a no-frills way for users to email you via a simple webform. If you like that module, but would also like those form submissions to be recorded in CiviCRM, then this no-frills extension is for you....
Current Usage: 0
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....
Current Usage: 0
Upgrades event iCal buttons to a better looking dropdown that includes a link to Google Calendar.
Current Usage: 0