The Google Singleton Detector, or GSD, is a tool which analyzes Java bytecode and detects the use of Singletons.
It's not quite as simple as that, however. First, GSD doesn't only detect singletons; it detects four different types of global state, including singletons, hingletons, mingletons and fingletons (see the usage section for descriptions). Second, it outputs a graph with all these different types of static state highlighted, and shows all the classes that are directly dependent on them. The point of this tool is to allow you to see all of the uses of global state inside a project, as well as how they are all interrelated. Hopefully you'll be able to locate global state that is heavily depended on and remove it.
Canoo WebTest is a free open source tool for automated testing of web applications.
It calls web pages and verifies results, giving comprehensive reports on success and failure. The White Paper provides an overview of the features and the design rationale. Detailed information is provided in the Manual Overview as well as the Install and Troubleshooting guides.
Tritonus is an implementation of the Java Sound API.
Currently, GNU/Linux i386 and Linux/PowerPC is supported. Some separately downloadable plugins also run on other JavaSound platforms. Support for other platforms is planned for the future.
While working for at Persistent Systems Pvt. Ltd., Pune, we developed a small library with Java and C++ wrappers to implement very high resolution timers. We use these timers to count the ticks when doing performance analysis and stuff like that.
Natural Docs is an open-source, extensible, multi-language documentation generator. You document your code in a natural syntax that reads like plain English. Natural Docs then scans your code and builds high-quality HTML documentation from it.