VisSim Programming Language is a visual block diagram language or Dataflow Diagram.It was developed by Visual Solutions in 1989.

Visual Basic Express is a fast and easy way to create programs for Microsoft Windows.

Prolog is based on Horn clauses, which are a subset of a formal system called predicate logic.

Visual FoxPro is Data-Oriented Programming language and Procedural programming Language. It was developed by Microsoft in 2007. It support Window 2000, Window XP and Window Server 2003 Operating System. The latest version of FoxPro can be worked on Mac OS, DOS, Window and Unix.