Xformat

Xformat makes it easy to format C, C++, Objective-C, and Objective-C++ code using common style guides such as LLVM, Mozilla, and WebKit.

You can also define your own styles directly in the app and see a preview as you go. When you are ready, you can use Xformat's Batch Format tool to quickly re-format an entire directory of source files, or use the included Xcode extension to do so directly from Xcode.