From Xspansion Business Solutions Ltd.:
NetSyncX provides synchronization between NetSuite and the Mac for calendaring, tasks, contacts and e-mail. The application accesses NetSuite via the SuiteFlex Web Services interface, using your usual NetSuite login credentials.
NetSyncX provides the link between the Apple iSync technology and NetSuite, enabling other iSync-enabled applications and devices to keep in sync with your NetSuite data. So now you can get your NetSuite calendar and contacts into Apple iCal and Apple Address Book, or carry it with you in your iSync-enabled PDA, phone or iPod!