Top 23 C# Office Projects

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1. NPOI

   1 16 5,962 9.4 C#

   a .NET library that can read/write Office formats without Microsoft Office installed. No COM+, no interop.

   

2. InfluxDB

   www.influxdata.com featured

   InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.

   

3. ClosedXML

   2 29 5,133 9.7 C#

   ClosedXML is a .NET library for reading, manipulating and writing Excel 2007+ (.xlsx, .xlsm) files. It aims to provide an intuitive and user-friendly interface to dealing with the underlying OpenXML API.

   

   Project mention: Automatizando a criação de planilhas com .NET | dev.to | 2025-02-09

4. Open XML SDK

   3 24 4,241 8.5 C#

   Open XML SDK by Microsoft

   

   Project mention: Top 5 C# PPT Libraries .NET Developers Should Be Familiar With | dev.to | 2025-02-23

   Open XML SDK is an open-source PowerPoint Interop Library that provides a low-level API for working with Microsoft PowerPoint files. It enables modifying existing PowerPoint files, making it a good option for applications that require direct XML manipulation of PowerPoint documents.

5. ExcelDataReader

   4 11 4,178 7.8 C#

   Lightweight and fast library written in C# for reading Microsoft Excel files

   

6. MiniExcel

   5 1 3,091 9.0 C#

   Fast, Low-Memory, Easy Excel .NET helper to import/export/template spreadsheet (support Linux, Mac)

   

7. Fluent.Ribbon

   6 1 2,649 8.5 C#

   WPF Ribbon control like in Office

   

8. DocX

   7 7 1,839 5.2 C#

   Fast and easy to use .NET library that creates or modifies Microsoft Word files without installing Word. (by xceedsoftware)

   

9. SaaSHub

   www.saashub.com featured

   SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

   

10. ExcelDna

    8 11 1,374 8.9 C#

    Excel-DNA - Free and easy .NET for Excel. This repository contains the core Excel-DNA library.

    

11. kms-activate

    9 1 852 10.0 C#

    Microsoft Windows/Office 一键激活工具

    

12. NetOffice

    10 1 732 7.1 C#

    🌌 Create add-ins and automation code for Microsoft Office applications.

    

13. MiniWord

    11 2 689 6.5 C#

    .NET Word(docx) exporting template engine without COM+ & interop (support Linux and Mac)

    

14. office-ribbonx-editor

    12 17 563 0.0 C#

    An overhauled fork of the original Custom UI Editor for Microsoft Office, built with WPF

    

15. toxy

    13 0 389 6.4 C#

    .net text extraction & export framework (by nissl-lab)

    

16. ShapeCrawler

    14 1 360 9.9 C#

    🍂 A .NET library for manipulating PowerPoint presentations

    

17. Report-From-DocX-HTML-To-PDF-Converter

    15 0 332 0.0 C#

    .NET Core library to create custom reports based on Word docx or HTML documents and convert to PDF

    

18. OfficeIMO

    16 8 333 9.2 C#

    Fast and easy to use cross-platform .NET library that creates or modifies Microsoft Word (DocX) and later also Excel (XLSX) files without installing any software. Library is based on Open XML SDK

    

19. WopiHost

    17 1 204 8.6 C#

    The most advanced .NET implementation of the WOPI protocol. Enables integration with WOPI clients such as Office Online Server.

    

20. BookFx

    18 0 109 0.0 C#

    Composing Excel spreadsheets based on a tree of nested components like the HTML DOM.

    

21. VisioAutomation

    19 1 102 2.0 C#

    Automate Microsoft Visio with .NET

    

22. OotD

    20 1 96 7.8 C#

    Outlook on the Desktop (OotD)

    

    Project mention: A Brief History of Code Signing at Mozilla | news.ycombinator.com | 2025-02-07

    I've actually got an action for this (based on fork, so can't take full credit): https://github.com/mscrivo/signtool-code-sign

    you can see a usage example here: https://github.com/mscrivo/OotD/blob/main/.github/workflows/...

23. RemindMe

    21 1 82 2.7 C#

    Reminds you of events with an un-missasble pop-up on your screen(provided you are at your computer, of course)

    

24. ExcelDna-Unpack

    22 0 60 3.9 C#

    Command-line utility to extract the contents of Excel-DNA add-ins packed with ExcelDnaPack

    

25. file-formats-windows-forms-demos

    23 0 11 7.3 C#

    This repository contains the samples for Syncfusion file format Windows Forms products and the guide to use them.

    

26. SaaSHub

    www.saashub.com featured

    SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

    

C# Office related posts

• Top 5 C# PPT Libraries .NET Developers Should Be Familiar With

  2 projects | dev.to | 23 Feb 2025

• Automatizando a criação de planilhas com .NET

  1 project | dev.to | 9 Feb 2025

• Resolve 'IBM437' is not a supported encoding name EPPlus

  1 project | dev.to | 5 Feb 2025

• Step-by-Step Guide: Easy Reporting with ClosedXML and Views

  1 project | dev.to | 26 Nov 2024

• ClosedXML y el uso de plantillas

  1 project | dev.to | 21 Jun 2024

• When XML in Word Became Illegal

  2 projects | news.ycombinator.com | 12 Oct 2023

• Visual Studio C#: Is it possible to manipulate Excel file via Visual Studio

  2 projects | /r/VisualStudio | 19 Jun 2023
• A note from our sponsor - SaaSHub
  www.saashub.com | 16 Jun 2025

  SaaSHub helps you find the best software and product alternatives Learn more →

Index

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