jouke hijlkema has published a nifty project that uses Org mode to draw flow charts. “Uses Org mode” means, in addition to the obvious, that the Org source tree reflects the diagram tree. The project is still new and development is ongoing but it seems to be usable now if you want to try it out. Hijlkema has installation instructions at the repository so it should be easy to give it a spin.
These days, flowcharts aren’t used very much to describe the logic of a program for “coders”. Still, the idea of a flowchart is useful for describing process flows even if they aren’t used as a precursor to writing code. The example Hijlkema shows is pretty complex and it’s easy to imagine it being adapted for all sorts of applications. If nothing else, it would be useful for documenting an algorithm flow.
The “source code” for the example is straightforward and shows that it would be easy to learn and use the application. If you have a need for something like this, take a look at the GitHub repository.