Extensions Directory
Extensions are installable packages which give CiviCRM new functionality, and this directory provides a centralized list of extensions which the CiviCRM community has created. This listing displays CiviCRM extensions that work on all Content Management Systems (CMS).
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This extensions makes the permission flag on a contact's relationship work as a true ACL.
CiviSEPA allows you free SEPA direct debit collections, if you are in Europe.
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.
Changes the default so it doesn't send a confirmation email when registering a contact to an event from the back office. Nothing more, really simple but avoids sending emails by mistake.
ReportPlus extends the default CiviCRM Form's Framweork adding new features
Allows CiviCRM to send emails and process bounces through the SparkPost service.
CiviCRM Extension that provides support for processing payments using Authorize.Net (Accept.js, Credit Card, ACH/EFT (eCheck), recurring billing).
Adds over 25 new fields to Summary Fields, including contributions by related contacts, plus fields for CiviMail, CiviEvent, and CiviGrant.
Warns users that their form (quickform) session is about to expire.
Omnipay is an open source payment processor library that supports multiple payment processors (around 30 currently).
You like how tags are displayed in the contact summary? This extension does the same, for groups. You can also add the contact to a group from the summary (click on the Groups label)