Java Console is a Java Command promt tool intended for Software Developers, System Administrators and as a plug in to other applications. It is a very powerful console client just run it and have fun
HUP is a heap-profiling tool that allows the exploration and reduction of heap space consumption in Java applications. The HUP tool allows a programmer to locate and remove memory bottlenecks, which are caused by unused objects.
xdProf is a tool that captures and analyzes stack traces sent at a fixed interval from Java Virtual Machines in a distributed system. The xdProf client uses a C/C++ Java Virtual Machine Profiling Interface (JVMPI) library and works on many platforms.
FLABot is a fault-localization and debugging tool for Eclipse plug-ins, which is based on architectural information for aproximating those regions of code where faults are most likely originated.