Web application security toolkit for Mac OS X
WebReaver.app is a web application security testing tool for Mac OS X. The tool takes full advantage of variety of native features to bring a powerful web penetrating testing toolkit on Mac.
Intercepting web proxy application for Mac OS X
Proxy.app is a native HTTP and HTTPS proxy for Mac OS X (not Java). It comes with tons of features such as automatic content length calculation, syntax highlighting, binary view and more.