VisualVM - VisualVM is a visual tool integrating several commandline JDK tools and lightweight profiling...
Eclipse Memory Analyzer - The Eclipse Foundation - home to a global community, the Eclipse IDE, Jakarta EE and over 350 open source projects, including runtimes, tools and frameworks.
JProfiler - JProfiler is the leading Java Profiler for profiling on the JVM. JProfiler's intuitive UI helps you resolve performance bottlenecks, pin down memory leaks and understand threading issues.
YourKit Java Profiler - Java profiler
ANTS Memory Profiler - ANTS Memory Profiler is a .
Yourkit - Java and .NET profilers. Continuous performance monitoring.