Mildly related: for complex diagrams where too much overlaps, consider yEd - which has functionality to rearrange boxes to minimize overlaps (and other settings

Mildly related: for complex diagrams where too much overlaps, consider yEd - which has functionality to rearrange boxes to minimize overlaps (and other settings) https://www.yworks.com/products/yed https://www.yworks.com/products/yed