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CLIF is an open load testing platform, including: load injectors, for generating traffic (a variety of protocols are supported such as HTTP, FTP, SIP...), and probes, for measuring resource usage (processor, memory, network...).    CLIF comes with test supervision features (including monitoring of response times, throughput, error rate, computing resources consumption), and analysis tools. Both command-line and graphical user interfaces are provided, including Eclipse plug-ins. CLIF is extensible through Java programming (new injectors, new probes).

SoapUI is a free and open source cross-platform Functional Testing solution. With a graphical interface, and enterprise-class features, soapUI allows to create and execute automated functional, regression, compliance, and load tests. In a single test environment, soapUI provides complete test coverage and supports all the standard protocols and technologies. There are simply no limits to what you can do with your tests. 

AQtime is an application profiler toolkit including more than a dozen profilers that provide complete, top-to-bottom application runtime and static analysis to help eliminate performance bottlenecks, memory leaks and other issues before they become quality problems. AQtime profiles C/C++, Delphi, .NET, Silverlight, and Java applications, and VBScript and JScript code. AQtime is available as a standalone application with its own rich UI, or as a plug-in to Microsoft Visual Studio and Embarcadero RAD Studio IDEs.

UISpec4J is an Open Source functional and/or unit testing library for Swing-based Java applications, built on top of JUnit and TestNG. UISpec4J's APIs are designed to hide as much as possible the complexity of Swing, resulting in easy to write and easy to read test scripts. This is especially true when comparing UISpec4J tests with those produced using Swing or low-level, event-based testing libraries.