Ugorji Nwoke: Dev Tool for GO AppEngine

Alternative development runtime/SDK for Go App Engine that relies less on the Python SDK.

ProdEagle - Welcome

ProdEagle allows you to monitor your (App Engine) web applications in real-time using beautiful graphs and alerts without harming the performance of your application!

Google App Engine Mini Profiler

gae_mini_profiler is a quick drop-in WSGI app that provides ubiquitous profiling of your existing GAE projects. It exposes both RPC statistics and standard profiling output for users of your choosing on your production site. Only requests coming from users of your choosing will be profiled, and others will not suffer any performance degradation.

Google App Engine Blog: Introducing ProtoRPC for writing App Engine Web Services in Python

ProtoRPC makes it easy to write consistent, reliable web interfaces that can be used, for example, to do the following:

• Create AJAX URL end-points for use by dynamic web pages and forms.
• Provide simple and understandable server-to-server communications.
• Become a back-end for command-line tools or other non-web based clients.

JVM Crash in Development App Engine server after Mac OS X Java SE 6 Update 4

Restoring the previous JDK (from Time Machine) to /System/Library/Java/JavaVirtualMachines/1.6.0.3.jdk and pointing Eclipse at it worked for me.

Easy Performance Profiling with Appstats

Easy Performance Profiling with Appstats

App Engine JavaScript SDK

"App Engine for JavaScript! With App Engine, you can build web applications using the JavaScript programming language, and take advantage of the many libraries, tools and frameworks for JavaScript that professional developers use to build world-class web applications. Your JavaScript application runs on Google's scalable infrastructure on top of Java and Rhino, and uses large-scale persistent storage and services."

objectify-appengine - Project Hosting on Google Code

"Objectify-Appengine provides the thinnest convenient layer which addresses these issues, yet preserves the elegance of get, put, delete, and query."