Many developers choose omnigraffl to create prototypes and flowcharts on Mac,
Here is a description of Felix. We recommend that you read it.
In addition, the following information may be helpful to you (from here ):
Omnigraffle pro is a powerful drawing software that provides you with the ability to draw charts, such as tree tables, flow tables, and page la S, you can also use omnigraffle to plan the plot trend of a movie or drama script, draw an organization diagram of the company, and display the steps required for a project.
In addition, it can also be used as an interface design tool for iPhone software. You need to download the ultimate iPhone stenric.
The omnigraffle pro 5.2:
Http://www.omnigroup.com/download/latest/OmniGrafflePro.dmg (the latest version is 5.2)
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License key: KJIZ-MLFE-YOLH-TYHR-YXWD-HDT