Top 20 NuGet office Packages

Extracts embedded OLE objects from Word, Excel, PowerPoint and Open Office files without needing the original programs.
NetOffice Outlook API, the .NET Wrapper Assemblies for accessing MS Office Outlook. This NuGet package targets the .NET Framework 4.0
NetOffice PowerPoint API, the .NET Wrapper Assemblies for accessing MS Office PowerPoint. This NuGet package targets the .NET Framework 4.5
GorillaDocs is a collection of assemblies that makes working with Microsoft VSTO easier. This package contains the code that applies to all Microsoft Office applications. Specifically: - Extension methods - WPF helpers - Logging classes
ASP.NET Core Library for The Identity Hub. The Identity Hub makes it easy to connect your app to all major identity providers like Microsoft, Facebook, Google, Twitter, Linked In and more. For more information see https://www.theidentityhub.com
An object model for the Office Open XML 2006 standard providing strongly typed classes that can be serialized/deserializsed to XML.
An object model for the Office 2003 2003 standard providing strongly typed classes that can be serialized/deserializsed to XML.
Read and Write Excel files Dynamically. and also you can see source code on github, just search "ExcelDynamicReaderWriter" on github ;)
Convert Word documents from docx to simple HTML
This SharePoint 2013+ javascript library is designed to easily develop SharePoint 2013/Online (Classic) solutions.
Generator for exporting data to Office (Excel and Word)
GorillaDocs is a collection of assemblies that makes working with Microsoft VSTO easier. This package contains the code that applies to Microsoft Word. Specifically: - Extension methods
GorillaDocs is a collection of assemblies that makes working with Microsoft VSTO easier. This package contains the code that applies to all Microsoft Office applications. Specifically: - Extension methods
uBeSocial is an Umbraco Back-Office extension that allows for easy posting to multiple social networks at once.
Fully featured faceted search engine library for ASP.NET (free edition)