Debugger Front-Ends

• Because gdb contains some scriptability support, many developers created graphical front-ends that sit on top of gdb, and supply a GUI support.
  
  
• xxgdb (based on the 2d Athena widget set) was an early attempt at such a front-end debugger. It works, but in today's standards looks quite ugly.
  
  
• Kdbg is a more modern variant. Despite being based on KDE's GUI, it's not too nicely designed, but it seems to do the job for smaller programs, and has an interesting notion for showing variables in a tree widget, which is very convenient.
  
  
• DDD, originally based on the Motif graphical library, is a more mature debugger, and has been around for a few years already. It has some interesting notion for showing variables, which takes a bit of getting used to.