Google App Engine Mac Launcher http://code.google.com/p/google-appengine-mac-launcher http://code.google.com/appengine
This project contains source code for the launcher, a Cocoa based developer tool for creating, running, and deploying Google App Engine applications. This launcher is included in the the App Engine SDK for Mac. The launcher delivered with the App Engine Windows SDK, GoogleAppEngineLauncher.exe, is also open source: http://code.google.com/p/google-appengine-wx-launcher
An xcodeproj which compiles this launcher outside of the Google build environment will be available shortly.