Business drawings include Flowcharts, Organizational Charts, Network Diagrams, Process Flow Diagrams, Software Design Diagrams, Cause and Effect Trees, Engineering Diagrams, Tables, Timelines, and other illustrations of functions or processes.
Business drawing, or diagramming, software is often lumped (inappropriately) with "graphics editors" like Paint Shop Pro or Adobe Illustrator. But unlike these bitmap-based "art" programs, diagramming software is typically vector-based and is designed to produce efficient schematics rather than pretty pictures.
Some business drawing programs offer a free trial version for download. See individual listings for details.