Griffon will automatically create the following entries in the application's manifest

Manifest-Version: 1.0
Ant-Version: Apache Ant 1.8.1
Created-By: ${jvm.version} (${jvm.vendor})
Main-Class: ${griffonApplicationClass} | ${griffonAppletClass}
Built-By: ${user.name}
Build-Date: dd-MM-yyyy HH:mm:ss
Griffon-Version: ${griffonVersion}
Implementation-Title: capitalize(${griffonAppName})
Implementation-Version: ${appVersion}
Implementation-Vendor: capitalize(${griffonAppName})

There might be times when you must specify additional attributes or override existing ones. You can do this by adding a new block of configuration to BuildConfig.groovy, for example

griffon {
    jars {
        manifest = [
            'Foo': 'Bar'
            'Built-By': 'Acme'
        ]
    }
}