CubeSQL is a nice SQL Server for use with Real Studio. Easy to deploy, easy to maintain and easy to use. And you can add functionality to it with our SQLite Extension.
CubeSQL is currently on sale and for orders you can use this coupon code: CUBESQLSPECIAL in the online store.
I also recommend SQLiteManager from the same company as it is a very nice tool for working with SQLite databases. I use it often to check whether the databases used in my Real Studio projects really contain what they should. Or to correct something in the database directly.