Code Loupe

Code Loupe is a powerful disassembly environment for Mac OS X. You can navigate, mark up, and understand disassembled code with speed and grace.

It lets you open frameworks, applications, dynamic libraries, and more. Code Loupe opens 32-bit and 64-bit Intel code in many forms. You can navigate through disassembly easily. Code Loupe has a variety of tools to help you visualize the flow of execution.