Findings:

• debugger
• Rotary debugger
• Memory Debugger
• debuggers (usergroup)
• debugger (user)
• Just-In-Time Debugger
• opcode
• 6502 instructions
• PIC opcodes
• edev: Vote and Cool opcode bugs

If you Log in you could create a "opcode debugger" node. If you don't already have an account, you can register here.