I tried to run Fiddler ( http://www.telerik.com/fiddler ) on my Mac, but there is no native version, so you need to use windows version with Mono Framework.
I downloaded Fiddler from official site, and after installing mono, I tried to run Fiddler:
Inside downloaded fiddler folder
bash-3.2$ mono Fiddler.exe
But got this stupid error:
Got a SIGSEGV while executing native code. This usually indicates a fatal error in the mono runtime or one of the native libraries used by your application.
So I searched a little bit, and found a solution: you need to run Fiddler in 32bit mode like this:
bash-3.2$ mono --arch=32 Fiddler.exe