I interned at a CAD/CAE company and our "cool" feature there was a history tree. I don't know maybe all of them do it today, but I remember being thoroughly imp

I interned at a CAD/CAE company and our "cool" feature there was a history tree. I don't know maybe all of them do it today, but I remember being thoroughly impressed then, having only seen word and simple editor undo/redo before. Since we had all the visualization bits written, we reused them and displayed it as a tree and you'd try different approaches as branches by clicking between them to compare. I guess it was basically as a seeing the history graph of a git repo, but this was about 5 years before git was created.