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

OpenSpout is a community driven fork of box/spout, a PHP library to read and write spreadsheet files (CSV, XLSX and ODS), in a fast and scalable way. Unlike other file readers or writers, it is capable of processing very large files, while keeping the memory usage really low (less than 3MB).

Go language library for reading and writing Microsoft Excel™ (XLAM / XLSM / XLSX / XLTM / XLTX) spreadsheets.
Excelize is a library written in pure Go providing a set of functions that allow you to write to and read from XLAM / XLSM / XLSX / XLTM / XLTX files. Supports reading and writing spreadsheet documents generated by Microsoft Excel™ 2007 and later. Supports complex components by high compatibility, and provided streaming API for generating or reading data from a worksheet with huge amounts of data. This library needs Go version 1.16 or later. The full docs can be seen using go's built-in documentation tool, or online at go.dev and docs reference.