Trace.java is a package used by Java programmers, testers, server administrators and others to understand what happened during the execution of a program. It doesn't generate tracing statements automatically; programmers have to add them. Trace messages go into an in-core ring buffer, a disk log, or both. The disk log can be fixed size with backups. What amount of detail gets logged can be controlled at runtime or launch time. The ring buffer and disk log can be controlled separately. Different subsystems of the code can be controlled independently.
OpenLoad is a tool for load-testing Web applications. It aims to be easy to use and providing near real-time performance measurements of the application under test. This is particulary useful when you are doing optimization as you can see the impact of your changes almost immediately.
xremote is a simple tool that lets you grab the mouse and keyboard of another machine and control them with your local mouse and keyboard. It creates a form of remote control of other machines. All mouse- and keyboard-actions on the local machine are forwarded to the remote display.
LogiTest is a Java application for functional and regression testing of Web sites. It currently supports GET and POST methods, HTTPS, cookies, browser history, XML formatted tests, simple Testlet API for writing new tests, user-defined HTTP headers and parameters, and regular expressions. Tests are recorded and played back through a easy-to-use GUI and can be stored and loaded from XML files.
Lloyd's Java Shell is a java scripting tool (it could read and execute java-like statement from any input stream) that could easily be plugged into an application and modify its object - so it is also a configuration tool. It is also a good test tool, as you could easily use it to test any feature of your new object.
OSDB, the open source database benchmark, is intended for the use of system and database developers, providing a significant chunk of benchmark code that can be used, tailored, and tweaked according to local needs. It is derived from AS3AP (ANSI SQL Standard and Portable Benchmark); its most important change is the segmentation of the benchmark, allowing developers to concentrate on the results that are most relevant to their work.