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 makes membership communications easier by creating activities for sending welcome email, renewal letters/email.
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Restrict users from viewing/editing contributions and other entities based on permission of financial types.
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This extension gives the administrator the possibility to define geogrpahical areas. Each contact is assigned the areas based on his address
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Have you ever wanted to rearrange the contact summary screen? Move the most important information to the top? Remove unnecessary stuff? Create a simplified layout for your volunteers and interns but a more robust layout for your fundraising team? This extension will let you do just that.
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Dummy SMS provider for CiviCRM. Useful to testing SMS functionality and integration.
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Create, configure and manage any number recurring tasks with this neat little extension - BUT: you have to know your way around SQL.
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With this extension you can export financial batches to CSV-documents, that can be imported into Winbooks using the infamous WbLink tool....
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This extension gives you the ability to relate the donor and the honoree on a contribution page.
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This extensions shows a new field on the contact summary tab which shows either the first activity of  the contact or the first group membership.    ...
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Geocoder extension provides geocoding from multiple providers (default is Open Street Maps) with advanced features over core geocoding Requires - CiviCRM 5.x, php 5.6 Credit : the Wikimedia Foundation
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Extension with Belgian magic....
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Places recently-viewed items in the Menu bar for quick access.
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View and respond to inbound SMS messages. To view, click on Mailings then SMS Inbox.
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