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

dotnetcore excel word poi openxml biff office-file-api

• Updated Nov 12, 2026
• 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.

excel xlsx openxml hacktoberfest xlsm closedxml hacktoberfest2020

• Updated Oct 21, 2026
• C#

Lightweight, fast and native cross-platform processing tool for importing and exporting spreadsheet documents.

csv excel xlsx openxml excel-report miniexcel

• Updated Nov 12, 2026
• C#

MIT-licensed, COM-free .NET libraries for creating, reading, editing, converting, rendering, and extracting Office, PDF, email, OneNote, and text formats.

c-sharp pdf document-conversion dotnet email word xlsx office docx openxml pptx pst hacktoberfest ost onenote document-generation openxml-sdk rag document-automation aspose-alternative

• Updated Nov 12, 2026
• C#

PowerPoint .NET library for reading, modifying, and generating PPTX presentations without Microsoft Office

csharp dotnet presentation slides powerpoint openxml pptx document-processing office-open-xml

• Updated Nov 11, 2026
• C#

Convert simple or advanced HTML into OpenXML Word content while reusing existing document styles, numbering, and templates. Originally created in 2009 and continuously maintained since.

dotnet-core docx openxml openxml-sdk

• Updated Nov 12, 2026
• C#

One of the most functional libraries to read and write .docx files (a.k.a. Microsoft Word documents or ECMA-376 Office Open XML) in Go.

xml word docx openxml docx-generator openxml-format openxml-sdk docx-files docx-converter openxml-word

• Updated May 6, 2025
• Go

Go library for reading and writing Microsoft Docx

microsoft go golang office docx document openxml ooxml doc openoffice

• Updated Aug 11, 2025
• Go

Fast and reliable way to work with Microsoft Excel™ [xlsx] files in Golang

microsoft golang excel xlsx spreadsheet openxml ooxml openoffice ecma376

• Updated Nov 4, 2020
• Go

DocxTemplater: C# library for generating DOCX documents with templates, supporting placeholders, loops, tables, charts, Markdown/HTML, and image embedding. Ideal for document automation.

word docx openxml docxtemplater docx-generator docx-template document-generator openxml-word

• Updated Nov 9, 2026
• C#

Open-source DOCX comparison tool to generate native Word tracked changes (redlines) in Python without MS Word dependencies

changelog docx openxml difference redline legal-tech openxml-word legal-technology docx-comparison docxodus compare-word-documents track-changes-api python-docx-diff

• Updated Oct 24, 2026
• Python

remark plugin to compile markdown to docx (Microsoft Word, Office Open XML).

markdown remark latex math word pandoc office docx highlight unified openxml mermaid mdast remark-plugin

• Updated Nov 12, 2026
• TypeScript

Swiss-army toolkit for .docx — faithful DOCX→HTML rendering, an in-browser block editor, Word-grade redlines with native tracked changes, and anchor-addressed markdown for LLM agents. .NET, WASM/TypeScript, Python, CLI.

python diff typescript csharp word wasm docx openxml ooxml agents docx-to-markdown redline document-comparison docx-editor llm tracked-changes docx-to-html

• Updated Nov 12, 2026
• C#

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

excel xlsx netstandard openxml ooxml

• Updated Feb 11, 2022
• C#

.NET Core library to convert Microsoft Office binary files (doc, xls and ppt) to Open XML (docx, xlsx and pptx).

microsoft-word office file-converter openxml net-core

• Updated Jun 10, 2024
• C#

A MS OpenXML Format Fuzzing Framework

python ms-office fuzz-testing openxml fuzzer openxml-files

• Updated Apr 10, 2018
• Python

Fresh PowerTools for OpenXml

dotnet openxml

• Updated Nov 12, 2026
• C#

Pure C# library to convert between document formats (Office 97-2003, Open XML, RTF, Markdown)

markdown dotnet office docx openxml

• Updated Oct 15, 2026
• C#

laravel 12.x docx template manipulation class, based on mustache templating language

pdf php-library word microsoft-word mustache reporting mustache-templates moustache docx openxml docxtemplater laravel-5-package

• Updated Sep 20, 2026
• PHP

Create or Modify Power Point/Presentation (pptx), Excel/Spreadsheet (xlsx) & Word/Document (docx) file with ease in Rust, C#, Python🚧⚒️, Java🚧⚒️,Go🚧⚒️ or Typescript🚧⚒️

excel xlsx spreadsheet office powerpoint docx openxml pptx msword excel-generation openxml-excel pptx-editor openxml-office pptx-generator

• Updated Nov 10, 2026
• Rust