Cloudbees-maven-demo is a project mainly written in Java, it's free.
A demo Maven project hosted by Cloudbees
WHAT IS CLOUDBEES MAVEN DEMO
It is a Maven porting of the default HelloWorld example which is shipped with CloudBees free PaaS offer. It offers a collection of tips & tricks to achieve a simple J2EE demo hosted by CloubBees just using Apache Maven; no Cloudbees SDK is needed, no Ant scripts.
For more info, visit http://sourcesense.github.com/cloudbees-maven-demo
I hope this effort will be useful for people who want to start playing with Cloudbees using Maven. Please also check the official Cloudbees Maven guide - https://cloudbees.zendesk.com/entries/421064-maven-guide