Complete list of Add-Ins

[niranjan]

Check "Read Me" document. It should come along with QTP9.1.
I copied and pasting it below:
Supported Add-ins
The following specific add-in versions are supported with QuickTest Professional 9.1:

QuickTest Professional Java Add-in 9.1
QuickTest Professional .NET Add-in 9.1
QuickTest Professional Oracle Add-in 8.2
QuickTest Professional PeopleSoft Add-in 8.2*
QuickTest Professional Add-in 8.2 for SAP Solutions
QuickTest Professional Siebel Add-in 8.0*
QuickTest Professional Stingray Add-in 8.2
QuickTest Professional Terminal Emulator Add-in 8.0*
QuickTest Professional VisualAge Smalltalk Add-in 8.2
QuickTest Professional Web Services Add-in 9.1
Note: You cannot use any other add-ins or add-in version with QuickTest Professional 9.1, except for those listed above.

* PeopleSoft Add-in 8.2, Siebel Add-in 8.0, and Terminal Emulator Add-in 8.0 all require an Add-in Upgrade patch before you can use them with QuickTest Professional 9.1. You can install Add-in Upgrade patches by running the relevant patch executable from the <QuickTest Professional>\AddinsUpgrade folder.

For more information and instructions, refer to the QuickTest Professional Installation Guide