Data Transfer Utility
This program allows QuickBooks users to quickly and easily transfer (merge) list and transaction data from one QuickBooks file to another QuickBooks file.
http://www.q2q.us
Transaction Pro Importer
Transfer Transaction or List Data to QuickBooks from Excel, Databases or Text Files:
http://www.baystateconsulting.com/
Alavara
Making sales tax less taxing
http://www.avalara.com/
Fishbowl
QuickBooks Inventory Management
http://www.fishbowlinventory.com/