JExcel – JavaScript spreadsheet web component – Open source

jExcel is a lightweight vanilla javascript plugin to create amazing web-based interactive tables and spreadsheets compatible with Excel or any other spreadsheet software. It was created to be an easy javascript data input tool for users and it was created inspired on the Handsontable and the Microsoft Excel.This software is free and was created to be a light alternative to Handsontable javascript spreadsheet. You can manipulate the jExcel javascript spreadsheet data with JSON, CSV or simple arrays, so it will be easy to integrate jExcel to any of your applications.

Source: bossanova.uk