an embeddable spreadsheet for your web application
...It can import and export the XLS and XLSX file formats and nearly the full range of Excel formula functions are supported. Most basic features are implemented as well as some of the more advanced ones. The userinterface is written entirely in JavaScript and its server-side API is pure Java based on the OpenXLS spreadsheet engine. Neither the client nor the server needs Excel or any browser plugins.
Sheetster is primarily intended for developers who want to integrate spreadsheets into their web applications. Towards that end it provides a server-side API for document storage connectors and a rich REST API for manipulating open spreadsheets. ...
DocsFree is the first and only open source java-based Docs App Server. DocsFree is offered as an alternative to proprietary Docs solutions MS Office Online and Sharepoint, as well as to proprietary Docs SaaS offerings such as Google Docs.
An OpenSource Javascript Spreadsheet project based on Qooxdoo javascript framework. This component is also a part of X4View Java Framework (see www.reasonsphere.com)
Web-based spreadsheet-like application written in PHP and uses dynamic and interactive user's interface written in JavaScript with jQuery library. Data based on XML.
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PHPEditTable is a class which mimics a simple spreadsheet behaviour. It handles cell formatting as well as math expressions based on cells' addresses parsing. Works with complicated formulas, setting properties on cell/row/column/range/sheet level.