Not from the era, but I suspect serious enterprise stuff (accounts, ERP etc.) in the 80s would generally be on minicomputers and mainframes, so you’re probably getting into stuff like RPG, PL/I, COBOL and myriad other languages that have faded away from common use.

For me it was Turbo Pascal, Turbo C/C++, regular Borland C++.

Not an enterprise app, but I worked on a project (kind of like a primitive CMS) for a church using PFS:Write and PFS:Professional File. That was a terrible experience.

Agreed: Borland was at its peak, and Turbo Pascal or Turbo C/C++ were used all the time. Turbo Vision was the framework under many applications: https://en.wikipedia.org/wiki/Turbo_Vision

Also, Clipper was very popular at that time: https://en.wikipedia.org/wiki/Clipper_(programming_language)