Database access software
SQL/DS (Structured Query Language/Data System), released in 1981, was IBM's first commercial relational-database management system. It implemented the SQL database-query language.
SQL/DS ran on the DOS/VSE and VM/CMS operating systems. A little later, IBM also introduced Db2, another SQL-based DBMS, this one for the MVS operating system. The two products have coexisted since then; however, SQL/DS was rebranded as "DB2 for VM and VSE" in the late 1990s.
Third party software.
Software AG's "Natural" 4GL was an early third-party software product that facilitated using "SQL/DS". "Software AG" used the name "Natural 2/SQL-DS" and, later on, for a related offering, "Natural 2/DB2".
References.
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