DataFlex
DataFlex is a relational database management system, self-described as an applications development database, originated around 1980.
It is a relatively early example of a fully fledged and commercially used fourth-generation programming language (4GL). In its early forms, DataFlex was available for Unix, VAX/VMS, TurboDOS, Novell NetWare, CP/M, MS-DOS and OS/2 operating systems. DataFlex is produced by the Data Access Corporation located in Miami. Data Access Corporation was founded in 1976.