SUDSJS has been developed to run with many different database systems. You can switch between then in the test system administration page. The administration page tells you what database is running at present. It is reset to CouchDB every morning. If you switch databases you may need to log in again. The login is email@example.com password demo.
This is not suitable for production, because it changes the database for the whole system (or at least the whole thread). It is intended for demonstration and testing only.
The databases in the test system are at various levels of development. The Couch database that loads up initially is probably the most tested. I am in the process of testing each configuration so there may be issues. These are generally due to the setup rather than program bugs.