Versaplex consists of two parts:

1. A proxy that accepts D-Bus messages and sends them to an ODBC-compliant database.
2. An ODBC driver that sends D-Bus messages to make its database queries.

You can mix and match these pieces. If you want to write your own D-Bus server, you'll be able to connect to it via ODBC. If you want to write your own database client library, like a Perl DBI module, you can make it query via D-Bus and thus talk to anything Versaplex can talk to.

Versaplex has already been ported to Linux and Windows and should be easy to port to other operating systems if there is interest.