a Maven plugin. You can use it as following:

<plugins>
  <plugin>
    <groupId>org.ow2.frascati.mojo</groupId>
    <artifactId>frascati-contribution-plugin</artifactId>
    <version>1.4</version>
    <executions>
      <execution>
        <id>frascati-contribution</id>
        <phase>package</phase>
        <goals>
          <goal>install</goal>
        </goals>
      </execution>
    </executions>
    <configuration>
      <include>
        <dependency>
          <groupId>org.ow2.frascati.examples</groupId>
          <artifactId>counter-server</artifactId>
          <version>1.4</version>
        </dependency>
        <dependency>
          <groupId>org.ow2.frascati.examples</groupId>
          <artifactId>counter-client</artifactId>
          <version>1.4</version>
        </dependency>
      </include>
      <deployables>
        <deployable>counter-server.composite</deployable>
        <deployable>counter-client.composite</deployable>
      </deployables>
    </configuration>
  </plugin>
</plugins>

It will generate the contribution (zip) file in the target directory.

a utility class: org.ow2.frascati.mojo.ContributionUtil allowing to create contribution files via a simple call:

import org.ow2.frascati.mojo.ContributionUtil;

Collection<File> jars = new ArrayList<File>();
Collection<String> deployables = new ArrayList<String>();

jars.add(new File("alib.jar"));
jars.add(new File("myapp.jar"));                  
deployables.add("mycomp.composite");
       
File workingDir = new File("./target");
        
File contribFile = ContributionUtil.makeContribution(jars, deployables, "mycontribution", workingDir);