The Open On-Chip Debugger
Debugging and programming interfaces for Freescale microcontroller
ADP is a bare-bones Python Debugger
Debugger for the IceBoy CPU
Outputs the map of values of a given PHP variable
Debug Facility for Real-Time issues
AVR simulator IDE
A COBOL debugger for GnuCOBOL/OpenCOBOL written in GnuCOBOL
GDB pretty printers for boost
An interpreter for the Lua language, written entirely in C#