Excel GitHub Repositories (2026) · Open Source Tools

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.

A developer-friendly API for converting many document formats into PDF files, and more!

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.

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

JasperReports® - Free Java Reporting Library

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

Local-first browser editor for Word, Excel, PowerPoint and PDF, with an experimental AI assistant. No Office installation or account required.

A pure rust library for reading and writing spreadsheet files

Automate real Microsoft Excel with AI via MCP Server or CLI — Power Query, DAX, VBA, PivotTables, and charts.

javascript based business reporting platform :rocket:

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

Database Reporting Tool and Tasks (.Net)

Actively maintained successor to Alibaba DataX — a fast, versatile, open-source ETL tool for 20+ RDBMS and NoSQL data sources.

Read and write simple Excel and CSV 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