JSysmon is a Java library providing access to system information like CPU or Memory usage on various platforms using native calls. It can be used to build cross-platform monitors in your applications.
inspectorJ is a crossplatform java profiler with a graphical client that allows for profiling remote jvms. inspectorj is pre-alpha and is currently under development.
This tool will be a cross-platform harness for distributed performance evaluation and test execution. The tool should offer a robust test execution service as well as management of input parameters, results and regression testing.