Roo-crm is a project mainly written in Java, it's free.
Getting Started with Roo
Example CRM application to learn Spring Roo. I'm using a MySQL database that I first created and then reverse-engineered.
In the package org.obliquid.crm.runner, I've built a few standalone and simple scripts to test some features in isolation.
The file src/main/resources/db-schema.sql contains the database dump.
Source code freely adapted and modified from Getting Started with Spring Roo: http://oreilly.com/catalog/0636920020981