Top 7 Openxml Open-Source Projects

excelize

15 17,250 8.9 Go

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

Project mention: Recommend a powerful excel processing library, @zurmokeeper/exceljs, which supports encryption and decryption of xlsx files and flexible setting of multiple table headers when exporting, etc. | /r/node | 2023-07-01

Then I found out that WPS only supports ecma376 standard encrytion for xlsx files. Then I referred to the official documentation and libraries in other languages, such as msoffcrypto-tool written in python. msoffcrypto-tool) and go's excelize. Since I don't know much about encryption and decryption, the process of implementation is also a bit of a twist.

NPOI

16 5,506 9.0 C#

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

www.influxdata.com sponsored

Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
ClosedXML

26 4,381 9.5 C#

ClosedXML is a .NET library for reading, manipulating and writing Excel 2007+ (.xlsx, .xlsm) files. It aims to provide an intuitive and user-friendly interface to dealing with the underlying OpenXML API.

Project mention: When XML in Word Became Illegal | news.ycombinator.com | 2023-10-12

It's also country specific.
I work on Excel library and the text to number/date feature was one of less fun things to implement at least semi-correctly.
I remember my comment on the PR back then:
https://github.com/ClosedXML/ClosedXML/pull/1899

MiniExcel

1 2,380 7.3 C#

Fast, Low-Memory, Easy Excel .NET helper to import/export/template spreadsheet (support Linux, Mac)
ShapeCrawler

1 244 9.4 C#

🍂 A .NET library for manipulating PowerPoint presentations
OfficeIMO

8 243 9.5 C#

Fast and easy to use cross-platform .NET library that creates or modifies Microsoft Word (DocX) and later also Excel (XLSX) files without installing any software. Library is based on Open XML SDK

Project mention: Get pagesetup header from a word document | /r/PowerShell | 2023-06-20

While I have method that allows easy find/search for stuff in headers - https://github.com/EvotecIT/OfficeIMO/blob/master/OfficeIMO.Examples/Word/FindAndReplace/FindAndReplace01.cs

BookFx

0 105 0.0 C#

Composing Excel spreadsheets based on a tree of nested components like the HTML DOM.
WorkOS

workos.com sponsored

The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2023-10-12.