The 1.9 version of Google App Engine SDK for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. Google App Engine SDK for Mac is categorized as Developer Tools. This free software for Mac OS X is an intellectual property of Google. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
Google App Engine lets you run your Web applications on Google's infrastructure. App Engine applications are easy to build, easy to maintain, and easy to scale as your traffic and data storage needs grow. With App Engine, there are no servers to maintain: You just upload your application, and it's ready to serve your users.
You can serve your app using a free domain name on the appspot.
You may want to check out more software for Mac, such as Google Apps Manager, Tab for Google+ Pro or Web SearchSpot for Google, which might be similar to Google App Engine SDK.
Download Managers
IDE