Add-in Express for VCL v9.1.0.1655 Source Code for Delphi 11 Alexandria 

Add-in Express for Office and Delphi VCL is the first visual tool for writing a COM add-in, smart tag and RTD server in Delphi. It completely supports these technologies and makes them very comfortable for programming extensions for all available Microsoft Office versions across 2000 through Microsoft Office 2013 and Office 2016 32-bit and 64-bit.

https://developer.team/delphi/31548-add-in-express-for-vcl-v9101655-source-code-for-delphi-11-alexandria.html