Export Queue (sf_queue)
The module sf_queue implements a queueing system for exports. Since Salesforce API's create and update functions can only modify up to 200
Notifications (sf_notifications)
Salesforce Outbound Messages (referred to as Notifications) are XML messages from Salesforce that can be sent based on Salesforce Workflow
Prematching (sf_prematch)
The module sf_prematch provides administrators the ability to set up duplicate prevention criteria on each fieldmap.
Salesforce Import (sf_import)
The module sf_import (bundled with salesforce) exposes a cron hook to import from SFDC and facilitate bidrectional sync on a cron schedule.