I have often thought to use some tools to develop and above all to maintain a project of large or medium size.
UML seems to be the most useful tool (editors UML).
But I also thought of developing a tool by myself. It should allow me to create simple rectangles, containing texts, connected together and, by double-clicking on one of them, go deeper. In short, a tool to manage blocks, each of which can contain other "sub diagrams". It should not be difficult to develop and could be useful.
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