RFFlow is a powerful, yet easy to use, tool for drawing flowcharts, organization charts, and many other kinds of diagrams. You will quickly create professional-looking charts for documents, presentations, or the Web.
RFFlow – Software for Flowcharts
Organization Charts, Business Diagrams, Presentations, Flow Charts, and Org Charts. This software is easy to use and well tuned for this work, you can do quite a lot with this powerful tool- delabs
The word flowchart has the same meaning as the words: flow chart, flow diagram, and flow sheet. The most popular are flow chart and flowchart. All are acceptable.
RFFlow allows you to quickly and easily draw cause maps. You can start with one of these samples and modify it for the problem you are solving.
Gantt charts show task and schedule information. The tasks are usually numbered and listed vertically. A bar shows the starting date and projected completion date of each task. Color or shading is sometimes used to show how much of each task has been completed. A Gantt chart is a management tool and a communications tool.
A cause-and-effect, fishbone, or Ishikawa diagram helps in identifying possible causes of a problem. 
Some More Features
- Circuit Diagram – RFFlow makes planning or documenting electronics a simple task.
- Flowcharts – This page includes samples of basic, detailed, deployment, and opportunity flowcharts
- Industrial Design – This diagram shows the physical layout of a wastewater treatment plant.
- Software Flowchart – A flowchart of a software component makes the flow of control Understandable