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 provides a heirarchical view of groups and their members at the url civicrm/groups/heirarchy. An additional Drupal permission is added for accessing this page as with large number of groups this is heavy on the number of database queries....
unknown
This extension makes membership communications easier by creating activities for sending welcome email, renewal letters/email.
unknown
This extension allows to find and export payment(s) for contribution(s).
unknown
CiviCRM Extension to support you with creating and maintaining households. It is currently under development, so feel free to contact us for the bits that are still missing - or simply contribute the implementations. The extension allows you to choose on of three household modes:...
unknown
This extension provide payment processor with PayLeap payment gateway....
unknown
This is a simple extension that collapses both the communication preferences and demographics sections by default on the summary page.
unknown
CiviCRM Admin Utilities modifies CiviCRM's behaviour and appearance in single site and multisite installs....
unknown
Many organizations using CiviCRM wish to measure the CHURN rate of their members. CHURN is closely related to the concept of average customer life time. For example, an annual churn rate of 25 percent implies an average customer life of four years. An annual churn rate of 33 percent implies an average customer life of three years. ...
unknown
Dummy SMS provider for CiviCRM. Useful to testing SMS functionality and integration.
unknown
Create, configure and manage any number recurring tasks with this neat little extension - BUT: you have to know your way around SQL.
unknown
With this extension you can export financial batches to CSV-documents, that can be imported into Winbooks using the infamous WbLink tool....
unknown
Restrict users from viewing/editing contributions and other entities based on permission of financial types.
unknown
This Extension uses the jquery plugin Slicknav to make the CiviCRM administration menu web responsive. Currently there is one breakpoint at 50em at which point the menu changes from a bar across the top to a hamburger style dropdown menu so that CiviCRM users can more easily navigate thru CiviCRM on small screens (tablets, phones etc.).  ...
unknown
This plugin integrates the Joomla and/or Community Builder registration process with CiviCRM....
unknown