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FoxBASE, a relational database from Fox Software, started off in 1984 as a clone of dBase II that boasted many speed improvements. FoxBASE+ adds feature parity and compatibility with dBase III Plus. It was later aquired by Microsoft and became FoxPro
Informix is a powerful high-speed high-end multi-user relational database program originally developed for Unix and Xenix in the C programming language. It includes form and report building tools.
Unify is a relational database for Unix based systems. There was also a DOS version.