The C++ GNU GPL 3 Free miptgraph directed graph layout library is on notabug at

The position() routine needs update and that is in development.
Also C interface is in development.

The mipt-vis compiler graph tool has updated version called showgraph-qt5 for qt5 at

The showgraph and mipt-vis tool need updates on parser code but maybe creating gcc plugin to generate data for it is easier.

The maintained GNU GPL mipt-vis in showgraph is in the codequery software at
That is in development.

More to follow.