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CleanSheets is the first spreadsheet application that is both extensible and platform-independent. It features a formula language that closely resembles that of Microsoft Excel, and extensions for aiding end-user programmers develop correct spreadsheets.
A tool for creating Spatial OLAP solutions on top of PostgreSQL + PostGIS (although working with solely conventional data is also possible). Results are presented in a spreadsheet frame (for conventional data) and in maps (for geographic data).
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Jeppers is a full featured web-based spreadsheet editor written in Java. It also provides an LGPL grid component that can be used in Swing applications.
AutoSpreadsheet is a programmable macro tool for .xls format spreadsheets. It is ideal for situations when you have to perform a repetitive series of operations on a spreadsheet with a known layout but with arbitrary data.
OO-Widgets is a Java Swing project that makes the JTable and other components much easier to use. This library differs from other Swing libraries in that it displays any set of pre-existing objects or JavaBeans.
Append hundreds of different XML files into one large data document, validate, and attach a stylesheet. Stitcher is a porwerful summary reporting tool. Allows for complex file storage locations of xml data. UBL, HR-ML, LandXML ... visit stitcher.org.
PHPDynaSite is a free Content Management System written in PHP/MySQL/Java applets.
It provides a lot of features such as image resizing, Spreadsheet and richtext editor, logs, ...
HSSFTemplates is a Servlet based template processor built around the Jakarta POI project. It has been moved to the Carbon Five Open Source project where its been renamed SST.
OpenJeks - free software. It's a "brick" to improve the spreadsheet Jeks from eTeks http://www.eteks.com. Openjeks can be plugged on a Jtable to format it with somes options (format, police, background, borders) for a cell or a cell set.
Regatta is a planning system for school personnel on a set of small tasks. It provides a better employment and mobility of teachers over the many activity programs. It supports budgets (time/money) of activity programs and forecasting of personnel needs
These tools are a simple way to experiment with programming objects and APIs. An object-oriented spreadsheet allows users to examine, create, and pass messages to hierarchical structures such as objects, XML, and SOAP/WSDL. Currently in OpenOffice & Java
This project seeks to develop a system for the creation and manipulation of cartoon special effects. Written in Java and using a spreadsheet style interface. The system also uses SVG to describe the images.
Java Internet Spreadsheet: A spreadsheet application written in 100% Java that offers the basic spreadsheet capabilities, like formulas, multiple tables/ sheets, charts and compatibility with common formats. Additionally this Java Internet Spreadsheet wi
JWorkbook is a Java class library for exporting data to spreadsheet files. The current version of JWorkbook can write data in the Gnumeric file format, and has partial support for the Excel file format (via POI).