Xlsx GitHub Repositories (2026) · Open Source Tools

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.

Free, open-source AI Office suite: Docs, Sheets, Slides, PDF, Markdown and HTML editors with a built-in AI agent, plus a `genoffice` CLI and agent skill so Claude Code, Codex and Cursor can create and edit real .docx/.xlsx/.pptx files locally. Bring your own key. macOS, Windows & Linux.

Build your own AI office with Univer Office SDK. Bring editing, calculation, collaboration, and file processing into your product for people and AI agents. Built on an extensible open-source core.

Open-source Android PDF and document toolkit with PDF tools, Office viewing, XLSX editing, scanning, and image editing. Built with Kotlin and Jetpack Compose.

Take a gander at any file. Offline, zero-permission Android viewer for PDF, Word, Excel, PowerPoint, ODT, RTF, ZIP, STL, photos, video, audio, Markdown and code.

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

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

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

Fast. Easy. Done. Processing spreadsheets without worrying about large files causing OOM.

SpreadCheetah is a high-performance .NET library for generating spreadsheet (Microsoft Excel XLSX) files.

A pure rust library for reading and writing spreadsheet files

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

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

An Excel to object mapper. Maps POCOs to and from Excel. Configuration via convention, attributes, or fluent methods.

Read and write Office Excel documents from Clojure

🐘 A PHP client for interacting with Gotenberg.

Lightweight and very fast XLSX Excel Spreadsheet Writer in PHP. Supports full XLSX-file functionality - cell formatting, formulas, styles, charts, etc.

OfficeDex is the first Al-Native VibeOfficing platform for documents, slides, and spreadsheets

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