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The Jaxen project is a Java XPath Engine. jaxen is a universal object model walker, capable of evaluating XPath expressions across multiple models. Currently supported are dom4j and JDOM . Jaxen provides a single point for XPath expression evaluation, regardless of the target object model, whether its dom4j, JDOM, DOM, JavaBeans, or whatnot.

The Java Chart Constuction Kit (JCCKit) is a small (< 100Kb) Java library and a very flexible framework for creating scientific charts and plots. The main purpose is to provide a flexible kit for writing Java applets and application with the need for visualizing scientific data. If you are looking for a lean scientific chart and plot library without all the unwanted bells and whistles of the heavy competitors try JCCKit. The key features of JCCKit are: * small (< 100Kb jar file) * highly configurable due to a sophisticated configuration concept * extensible (1/3 of all classes are interfaces or abstract classes.) * automatic updating if data changes * easy programming of dynamic charts and plots * automatic rescaling if canvas size changes * out-of-the-box applet for presenting static data on a web page without Java programming * automatically generates a legend

Jlint will check your Java code and find bugs, inconsistencies and synchronization problems by doing data flow analysis and building the lock graph.

The Java Decompiler project aims to develop tools in order to decompile and analyze Java 5 byte code and later versions. JD-GUI is a standalone graphical utility that displays Java source codes of .class files. You can browse the reconstructed source code with the JD-GUI for instant access to methods and fields.

JDOM is a Java library for accessing and manipulating XML documents. It has a straightforward API, is a lightweight and fast, and is optimized for the Java programmer. It's an alternative to DOM and SAX, although it integrates well with both DOM and SAX.

JFlex is a lexical analyzer generator for Java written in Java. It is also a rewrite of the very useful tool JLex which was developed by Elliot Berk at Princeton University. As Vern Paxon states for his C/C++ tool flex: They do not share any code though.

JGraphT is a free Java graph library that provides mathematical graph-theory objects and algorithms. JGraphT supports various types of graphs including: * directed and undirected graphs. * graphs with weighted / unweighted / labeled or any user-defined edges. * various edge multiplicity options, including: simple-graphs, multigraphs, pseudographs. * unmodifiable graphs - allow modules to provide "read-only" access to internal graphs. * listenable graphs - allow external listeners to track modification events. * subgraphs graphs that are auto-updating subgraph views on other graphs. * all compositions of above graphs. Although powerful, JGraphT is designed to be simple. For example, graph vertices can be of any objects. You can create graphs based on: Strings, URLs, XML documents, etc; you can even create graphs of graphs!

JODE is a java package containing a decompiler and an optimizer for java. This package is freely available under the GNU GPL. The bytecode package and the core decompiler is now under GNU Lesser General Public License, so you can integrate it in your project. Can be used from command line or through the Swing-based GUI. The decompiler reads in class files and produces something similar to the original java file. Jode has support for all constructs of JDK-1.3 including inner and anonymous classes. The optimizer transforms class files in various ways with can be controlled by a script file. It supports the following operations: . Renaming class, method, field and local names to shorter, obfuscated, or unique names or according to a given translation table . Removing debugging information . Removing dead code (classes, fields, methods) and constant fields . Optimizing local variable allocation

OpenJDK is an open-source implementation of the Java Platform, Standard Edition. Much of the OpenJDK code is licensed under the GPL version 2 with the Classpath exception. The Java Hotspot virtual machine source code is licensed under the GPL version 2 only.

This is a port of JUnit, a simple testing framework for Java developed by Erich Gamma and Kent Beck. Using JUnit you can build a test suite that will help you measure your progress, spot unintended side effects, and focus your development efforts.