Openxml GitHub Repositories (2026) · Open Source Tools

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

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.

Your diagrams, as requested. A clean-room, headless Rust core for Visio's .vsdx files and ShapeSheet, with a CLI and an MCP server.

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

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.

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