Tested with Sails 0.9
An in-memory object store which works great as a bundled, starter database (with the strict caveat that it is for non-production use only).
Waterline is a new kind of storage and retrieval engine. It provides a uniform API for accessing stuff from different kinds of databases, protocols, and 3rd party APIs. That means you write the same code to get users, whether they live in mySQL, LDAP, MongoDB, or Facebook.