JRuby on Google App Engine has come a long way, recently with improvements in JRuby 1.5.1. Also: work on native extension support in Ruby Summer of Code.
Some of the later helper frameworks and tools for applications written for Google App Engine are: SimpleDS and Objectify - two persistence frameworks, Kotori – a JUnit runner, Apple Guice – a case study GWT application, and Engine Watch – a GAE monitoring application for Android devices.
Google App Engine was initially using Apache Tomcat as their webserver/servlet container but eventually switched to Jetty.
JRuby 1.3 is now available, bringing performance improvements and compatibility with Google AppEngine. Work on other improvements is continuing and a first version of the ruby2java compiler is now available. Also: InvokeDynamic support is making it's way into the builds for the next Java version.
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With JRuby 1.2 released, the JRuby community is working on new projects such as a new Ruby to bytecode compiler, a standalone JRuby parser and a first release of the bytecode generating DSL Bitescript. Also: JRuby works on Google App Engine's newly announced Java support.
Google has broadened their Google App Engine (GAE) support to include Java in addition to Python. However, it also imposes a number of limitations on the GAE Java applications to further Google's ability to scale and cluster them with minimal effort.