Free and open source consulting-style Powerpoint toolbar

Markdown add-in for Microsoft Office OneNote

Visual Studio C# (project) template for easy Revit add-in creation

Macro Tools VBA - add-in, tool for automating the development of macros in the Visual Basic Editor (VBE) MS Excel and Word

OLAP PivotTable Extensions is an Excel add-in which extends the functionality of PivotTables on Analysis Services cubes and of the Excel Data Model (Power Pivot)

Common tools for MS Excel

Call R from Excel. Create new Excel functions that make use of R packages. Integrate both tools seamlessly.

This add-in allows to embed PlantUml diagrams in PowerPoint presentations.

Excel add-in converting excel to json

🍰 🧩 🏷️ Cake addin that makes MinVer available in Cake builds. MinVer is a tool for versioning projects using Git tags

An Excel Add-In allowing calculations of the friction pressure loss (head loss) in circular pipes with full flow water in SI Units.

Excel add-in that monitors your clipboard and automatically pastes copied text into the active worksheet.

Sample of Managed Extensibility Framework (MEF)

A Microsoft Excel Add-in based on Excel-DNA which adds new user-defined functions (e.g. stock quote queries).

Fusion 360 dogbone add-in (direct hole tool)

Stock Quote Add-In For Excel 2016 And 2013

This TIA Add-In allows you to connect your VCI workspace to a Git repository

Java Toolkit for IBM Domino Addin Server Tasks (see https://jaddin.k43.ch)

An add-in for Autodesk Fusion 360 that provides advanced parameter options to help with prototyping.

PhotoAlbum is a vsto word add-in to help creating photo albums in msWord