The Sakai Wicket Maven Archetype allows you to generate a sample Sakai app via a single Maven command.
The app is based on Apache Wicket which integrates nicely with Sakai.
The app demonstrates how to get a Sakai tool styled, internationalised and registered, setup your own APIs, wire them up with Spring and inject them via annotations.
The 1.1 and up releases also include multi database support via Spring JDBC. It could easily be used as a base for a real tool.
1.6.0, based on Wicket 6.25.0
Run the following and follow the prompts:
mvn archetype:generate -DarchetypeGroupId=org.sakaiproject.maven-archetype -DarchetypeArtifactId=sakai-wicket-maven-archetype -DarchetypeVersion=1.6.0 -DgroupId=org.sakaiproject.example -DartifactId=exampleApp
The output of the above command will produce a project that you can build and deploy to Sakai via mvn clean install sakai:deploy or add to Eclipse and extend.