JSwat
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JSwat is a standalone, graphical Java debugger front-end, written to use the Java Platform Debugger Architecture. JSwat is licensed under the GNU General Public License and it is freely available in both binary and source code form.
Features include breakpoints with conditionals and monitors; colorized source code display; graphical display panels showing threads, stack frames, visible variables, and loaded classes; command interface for more advanced features; Java-like expression evaluation, including method invocation; a non-graphical mode for use in consoles; and graceful handling of non-Java code.