Clarion (1989) 6 Database DOS

Clarion is an advanced user friendly 4GL DBMS and programming environment for DOS and Windows. It boasted the ability to greatly reduce application development time, featured highly integrated visual creation tools, and a powerful set of program functions.

• 3.1 (DOS)

Derive (1994) 3 Mathematics DOS

Derive was a computer algebra and graphing system, developed as a successor to muMATH by Soft Warehouse, Inc. in Honolulu, Hawaii, now owned by Texas Instruments. Derive was implemented in muLISP, also by Soft Warehouse. The first release was in 1988 for DOS. It was discontinued on June 29, 2007 in favor of the TI-Nspire CAS. The last and final version is Derive 6.1 for Windows.

• 3.x