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:

Move a contribution from one contact to another. This can be done through the contact's contribution tab or through search results.
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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. ...
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The extension installs a line item report for the participant, membership, and contribution entities. The report will allow you to select standard columns for these entities, along with custom fields and any price set field that is applicable for the entity. Filters are also also available for each of the price set fields....
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Restrict online registration to certain events to members only but still have other events open to the public.
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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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processor plugin but no longer recommended
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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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