The following eleven (11) Apps found within the Intuit App Center can help you import, export, delete, manipulate and safeguard your QuickBooks Online 'company' data. We did NOT include Apps intended to import data from either 'general' or 'specific' 3rd-party Shopping Carts or EDI applications. (We will look at those in a future article.)
Please note that the following Apps are listed in alphabetical order by App name, the order is not reflective or any rating, ranking, or other consideration.

by Zed Systems
Axis QBO App
Axis - Import & export utility

by CloudBusiness
QBO Bulk Deleter
Bulk Deleter

by Cloud Business
QBO Business Importer
Business Importer

by SaasAnt
Excel Transactions QBO App
Excel Transactions

by ASM Development
QBO Guru Importer
Guru Importer

by AaaTeX Corp.
QBO IIF Importer
IIFImporter for QuickBooks Online

by FLEXquarters.com QODBC
QBO QODBC
QODBC for QuickBooks Online

by Jobber
SafetyNet QBO
SafetyNet

by Transactions Plus
Transaction Plus QBO
Transactions Plus

by Baystate Consulting
QBO Transaction Pro Deleter
Transaction Pro Deleter (for QBO)

by Baystate Consulting
QBO Transaction Pro Importer
Transaction Pro Importer (for QBO)
I would mention here that there may be other 3rd-party Apps by other vendors, that perform the same, or similar, functions that have chosen NOT to be listed on the Intuit App Center; however, we made no provisions for the inclusion of such Apps (or vendors).