How to build flowcharts?

Question

block diagram

Hello.
How can you build school flowcharts (preferably automatically)?
Manually drawing in Paint-Word-Visio-Dio and other editors is not at all convenient, crooked and long.
For pascal, I found fceditor, which builds this circuit directly from the code, and this is the best option I have tried. But unfortunately it only works for Pascal.
What is needed is the usual flowcharts, not class or flow diagrams or some other uml.
While googling, I came across a certain afce, but it does the opposite thing.