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? SheetJS Spreadsheet Data Toolkit -- New home https://git.sheetjs.com/SheetJS/sheetjs

JavaScript Data Grid / Data Table with a Spreadsheet Look & Feel. Works with React, Angular, and Vue. Supported by the Handsontable team ?

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

Luckysheet is an online spreadsheet like excel that is powerful, simple to configure, and completely open source.

The project has been migrated to @wolf-table/table https://github.com/wolf-table/table

A pure PHP library for reading and writing spreadsheet files

Univer is a full-stack framework for creating and editing spreadsheets, documents, and slides on both web and server.

Jspreadsheet is a lightweight JavaScript data grid component for creating interactive data grids with advanced spreadsheet controls.

Go library for reading and writing XLSX files.

ONLYOFFICE Docs is a free collaborative online office suite comprising viewers and editors for texts, spreadsheets and presentations, forms and PDF, fully compatible with Office Open XML formats: .docx, .xlsx, .pptx and enabling collaborative editing in real time.