Debug Applications, Applets, Servlets and EJBs.
Local and Remote debugging.
Run, Attach and Listen.
User friendly GUI.
Multi-Thread debugging.
Breakpoint Groups.
Data Tool Tips.
Hot Swap classes and Pop stack frames.
Save settings in Projects.
Modify primitive variables.
Display loaded classes.
Display toString() results.
Display Chained Exceptions.
Display Memory Usage and Java System Properties.
Evaluate simple Expressions including Method Calls.
Stop on Thread Start and Death events.
Stop on Class Load and Unload events.
Stop on Method Entry and Exit events.
Stop on Field Watchpoint events.
Launch External Text Editor.

http://www.debugtools.com/download.html

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