[Qt-interest] OSX debugger

[Info]

Can anyone recommend a good graphical debugger for OSX? I'm developing  
a cross-platform application using Visual Studio in Windows and GDB in  
OSX and I'm finding it much quicker to debug in Windows due to the  
graphical nature of the debugger (Visual Studio and Windbg) but can't  
find anything similar for OSX (Other than Insight which I can't seem  
to get running). Does anyone have any recommendations? What do you use?