Luckysheet is an online spreadsheet like excel that is powerful, simple to configure, and completely open source.
table2excel is a jQuery plugin to export HTML table to Excel Spreadsheet Compatible Files.
SheetJS js-xlsx is a parser and writer for various spreadsheet formats. Pure-JS cleanroom implementation from official specifications, related documents, and test files. This is the community version.
jExcel is a jQuery plugin to embed a spreadsheet, compatible with Excel, in your browser.
You can load data straight to the table from a JS array, json or even a CSV file. You can copy and paste from or to Excel straight to jExcel.
Read, manipulate and write spreadsheet data and styles to XLSX and JSON. Reverse engineered from Excel spreadsheet files as a project.
TableNav is a jQuery utility plugin providing navigation with arrow keys in a table with input fields.
ParamQuery grid is a lightweight jQuery grid plugin inspired by MS Excel and Google spreadsheet. It's based upon jQueryUI Widget factory which is an excellent design pattern for UI controls with consistent API. It's free to use.
Handsontable is a minimalistic approach to Excel-like table editor in HTML & jQuery. Now with column and row headers.