Hi Adam,
This is just our public sandbox, we don't publish apps that are using the APIs here to do initial beta or play around with APIs (we wouldn't know all of them nor have access to their code or detailed app functionality until they become part of our code program).
However, for Ignite for Millennium (the name of our product for the Millennium FHIR implementation), when a client installs it, they get at least one of their own non-prods hooked up to the Ignite services for development and testing against their internal build.
Regards,
Jenni