Jep is a Java library for parsing and evaluating mathematical expressions. With this package you can allow your users to enter an arbitrary formula as a string, and instantly evaluate it. Jep supports user defined variables, constants, and functions.
Downloads: 42272 - Shareware - Download Now

The Java Excel Connector (JEC) allows Java developers to access the Excel application, read, create or modify Excel workbooks and charts.
Downloads: 41967 - Demo - Download Now

The MoneyToys - Very Simple Loan Calculator applet is designed to allow webmasters to instantly add interactivity to a web site by providing users with an easy-to-use loan calculator.
Downloads: 42054 - Shareware - Download Now

The JDirectoryChooser provides a GUI for navigating the file system, and then either choosing an existing directory from a tree or managing directories' tree structure by creating new directories, renaming, moving or deleting existing directories.
Downloads: 41890 - Shareware - Download Now

Java charts. Bean , Applet and servlet that will create charts for your web site of java application. It supports more than 18 2D and 3D types of charts and combinations of them. It supports interactive features like zoom , scroll, tips and links.
Downloads: 42001 - Demo - Download Now