office-addin topic
AutoXL
A fundamental library of Excel functions written in Excel formula language by LAMBDA function for spreadsheet automation
xloil
xlOil provides framework for interacting with Excel in different programming languages (python & C++ currently)
advanced-formula-environment
Create, edit, and reuse formulas in Excel
bkt-toolbox
Business Kasper Toolbox (BKT) for Microsoft Office
easy-code-formatter-styles
Open source styles repository for Easy Code Formatter
office-addin-validator
Functionality has moved to https://github.com/OfficeDev/Office-Addin-Scripts/tree/master/packages/office-addin-manifest
TextCraft
Integrates AI tools into Microsoft® Word® (independently developed, not affiliated with Microsoft)