Can I manage something other than a simple Rails application with Scalarium?

Yes!

Scalarium has build-in automation and support from Rails applications, PHP applications, and static HTML Web pages.

Utilizing the power of Chef cookbooks you can automate the deployment of your application, should it not fit in the above list.

With custom Chef cookbooks you can make sure that memcached is automatically started, MySQL slave replication is setup, or that your custom Java application will be deployed correctly.