CodeDesigner is a free open-source RAD tool that will help you create various diagrams describing app' structure and logic as well as to generate production-ready source code from them.
The program allows you to create UML diagrams, simple state diagrams and hierarchical state diagrams.
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It supports ANSI C, C++ and Python languages. If you add enough details, the program can create the code for the application out of the diagram.
It is a free alternative to commercial tools like Enterprise Architect or IAR VisualState.
Comments
They should upload a guide how to use it is in English too and I almost don't understand that.