Top XLS GitHub Repositories & Tools (2026)

An open-source Office workspace where people and AI agents create, collaborate, and review together.

Get your documents ready for gen AI

OfficeCLI is the first and best Office suite purpose-built for AI agents to read, edit, and automate Word, Excel, and PowerPoint files. Free, open-source, single binary, no Office installation required.

Any file → clean Markdown for AI agents: PDF, Word, PowerPoint, Excel, EPUB, HTML and web pages, images (OCR), audio and video (metadata, subtitles, transcripts). A fast Rust MCP server and CLI that runs on your machine. No API key.

Go language library for reading and writing Microsoft Excel™ (XLAM / XLSM / XLSX / XLTM / XLTX) spreadsheets

A browser-based viewer for Office Open XML documents that renders to an HTML Canvas element.

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

A lightweight Typescript library that interacts with Gotenberg's different modules to convert a variety of document formats to PDF files.

MIT-licensed PowerShell document automation for Word, Excel, PowerPoint, PDF, email, PST/OST, OneNote, Visio, OpenDocument, and mixed-format Reader workflows.

Native OOXML engines in Rust - DOCX, XLSX & PPTX editing, rendering and real-time collaboration, compiled to WASM for the web.

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

Read and write spreadsheet files (CSV, XLSX and ODS), in a fast and scalable way