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First released in 1983 by T & W Systems Inc (later Versacad Corporation) and based on their earlier T-Square product, VersaCAD is a sophisticated professional object design and drawing tool for the IBM PC. It competed heavily against AutoCAD. A very in-depth history of VersaCAD can be found on Cadhistory (PDF Link)
Voyetra Sequencer is a popular, powerful, and professional MIDI music recording and editing program. It was often bundled with Sound Blaster sound cards.