This application is just outstanding ...
The original application was buy by Omnigroup in 2013 but the product we ultimately suppressed from their catalog. Fortunately, Omnigroup released the source code as the open source the project GraphSketcher (many thanks to them).
This very elegant application allows to create rapidly and interactively a large panel of diagrams that are very useful in the context of a business or scientific presentation, of a lecture , etc ... Perhaps somewhat "niche market" (?) probably explaining the commercial failure, but this is really a pity since I don't know any equivalent application ... Kudos for Robin Stewart who created the first release of this program !