Im making that at least for graph editing:
Its a general purpose DAG/flowchart editor completely optimized for keyboard shortcuts. No need to touch the mouse almost ever. Like excalidraw you can use a basic version immediately, no account. I recommend watching the 1min video and checking out the keyboard shortcuts menu because its a bit different from other flowchart editors.
1min tutorial: https://www.youtube.com/watch?v=rPR0samb194