I’m a mainframe developer and I have used Graphviz for a few things. Graphical presentation of JCL and the relations between jobs in our scheduler.
Files are created on the mainframe and moved to my PC, where I am running version 2.38.
Though it has been about 40 years since I used JCL, I think applying Graphviz to job schedules is a nifty idea.
p.s. note that release 2.44.1 is available.