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Top 23 C# Excel Projects
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NPOI
a .NET library that can read/write Office formats without Microsoft Office installed. No COM+, no interop.
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InfluxDB
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.
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ClosedXML
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.
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MiniExcel
Fast, Low-Memory, Easy Excel .NET helper to import/export/template spreadsheet (support Linux, Mac)
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Magicodes.IE
Import and export general library, support Dto import and export, template export, fancy export and dynamic export, support Excel, Csv, Word, Pdf and Html.
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EvilClippy
A cross-platform assistant for creating malicious MS Office documents. Can hide VBA macros, stomp VBA code (via P-Code) and confuse macro analysis tools. Runs on Linux, OSX and Windows.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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ReoGrid
Fast and powerful .NET spreadsheet component, support data format, freeze, outline, formula calculation, chart, script execution and etc. Compatible with Excel 2007 (.xlsx) format and working on .NET 3.5 (or client profile), WPF and Android platform.
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ExcelDna
Excel-DNA - Free and easy .NET for Excel. This repository contains the core Excel-DNA library.
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ExcelMapper
An Excel to object mapper. Maps POCOs to and from Excel. Configuration via convention, attributes, or fluent methods.
Project mention: .NET: Integration Test for uploading csv/excel file via HttpClient | dev.to | 2025-02-07ExcelMapper for working with Excel file
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Npoi.Mapper
Use this tool to import or export data with Excel file. The tool is a convention based mapper between strong typed object and Excel data via NPOI.
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ClosedXML.Report
ClosedXML.Report is a tool for report generation with which you can easily export any data from your .NET classes to Excel using a XLSX-template.
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office-ribbonx-editor
An overhauled fork of the original Custom UI Editor for Microsoft Office, built with WPF
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BakingSheet
Easy datasheet management for C# and Unity. Supports Excel, Google Sheet, JSON and CSV format.
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FileContextCore
FileContextCore is a "Database"-Provider for Entity Framework Core and adds the ability to store information in files instead of being limited to databases.
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BulkPDF
BulkPDF is a free and easy to use open source software, which allows to automatically fill an existing PDF form with differen values. Only a spreadsheet (Microsoft Excel 2007/2010/2013, LibreOffice or OpenOffice Calc) with the desired values is required.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
C# Excel discussion
C# Excel related posts
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Automatizando a criação de planilhas com .NET
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.NET: Integration Test for uploading csv/excel file via HttpClient
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Step-by-Step Guide: Easy Reporting with ClosedXML and Views
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ClosedXML y el uso de plantillas
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My Animal Mart (Part 2) - The data config problem.
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C# Excel read/write on the cheap
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When XML in Word Became Illegal
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A note from our sponsor - InfluxDB
www.influxdata.com | 23 Jun 2025
Index
What are some of the best open-source Excel projects in C#? This list will help you:
# | Project | Stars |
---|---|---|
1 | NPOI | 5,966 |
2 | ClosedXML | 5,140 |
3 | ExcelDataReader | 4,181 |
4 | MiniExcel | 3,114 |
5 | Magicodes.IE | 2,175 |
6 | EvilClippy | 2,156 |
7 | EPPlus | 1,932 |
8 | ReoGrid | 1,480 |
9 | ExcelDna | 1,379 |
10 | Unity-QuickSheet | 1,066 |
11 | ExcelMapper | 855 |
12 | NetOffice | 733 |
13 | Npoi.Mapper | 621 |
14 | sqlnotebook | 611 |
15 | ClosedXML.Report | 581 |
16 | office-ribbonx-editor | 563 |
17 | BakingSheet | 390 |
18 | BlazorDatasheet | 310 |
19 | Sylvan.Data.Excel | 276 |
20 | PowerQueryNet | 197 |
21 | FileContextCore | 172 |
22 | BulkPDF | 133 |
23 | BookFx | 109 |