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.
A fully fledged native jQuery spreadsheet plugin, designed to look and feel like Google sheets.
It supports a full stack of spreadsheet operations, including: formulas, sorting, formatting, borders, moving rows, columns, frozen rows or columns, merging.. and so much more!
jQuery.sheet manages the sheet creation, viewing, and editing processes using simple html tables and html5 components to provide stabilizability even in older web browsers. jQuery.sheet can even be used like a datagrid, without formulas.
Sheetrock is a jQuery plugin for querying, retrieving, and displaying data from Google Spreadsheets. Use it to load entire sheets or leverage SQL-like queries to treat Google Spreadsheets as a quick-and-dirty JSON datastore.
Editable Table is a tiny jQuery plugin turns any table into an editable spreadsheet.
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.