Objectify-Appengine is a thin Java wrapper around Google App Engine's low-level datastore API that allows you to persist type-safe POJO objects. It provides a human-friendly query interface, generified key, query, and prepared query classes, GWT-able entity objects, and transactions in one lightweight jar file with no dependencies.
JSONBOT is a remote event-driven framework for building bots that talk JSON to each other over XMPP. This distribution provides bots built on the JSONBOT framework for console, IRC, XMPP for the shell and WWW, and XMPP for the Google App Engine. A plugin infrastructure can be used to write your own functionality.
VyperBlog is an all-in-one site template for the Google App Engine. It is meant for small businesses or enterprises that want to get into the Google cloud using a turn-key solution that provides security and safety for the data being stored in the back-end database. VyperBlog provides protection from hackers and crackers who might want to abuse forms and other resources being published by those who are using VyperBlog. VyperBlog employs a unique method for securing sites called Secure-Site.
tadedon is a set of utilities that form a foundation for applications written with one of the many Java frameworks, such as GWT, GIN, Guice, Google App Engine, commons-configuration, and many others. It lets you specify the default configuration of your application and upgrade it automatically on each new release. It can redirect all java.util.logging to slf4j and easily configure logback. It can bind application configuration in a Guice module. It supports @PostConstruct and @PreDestroy annotations (JSR 250) in Guice applications. It lets you annotate your methods with @Transactional annotation. It supports Guice injector stage in your Web application. It lets you test your Guice managed servlets and filters without needing a real servlet container. It lets you use Guice Matchers for matching super class, interface, and type literal annotations. It can inject event bus to your GWT applications with the help of GIN.