OpenLink Virtuoso is a new Virtual Database Engine [that] will
enable disparate backend databases to be viewed, updated, and
manipulated from a single source known as the “Virtual
Database”.
Virtuoso supports Oracle, Microsoft SQL Server, Informix, Sybase
SQL Server, Ingres, Progress, DB/2, and other ODBC compliant
database engines.
Virtuoso is also 100% standards based supporting ODBC, JDBC, OLE
DB. It is also operating system independent with support for
Windows 95/98/NT, Linux, [and] UNIX (all flavors)….