Everywhere! 3rd gen factory robotics, and manipulator control. Movie cg renderers and asset transformation pipelines (heck, get busy and finish inkscape!) Ehr systems. ERP systems. Risk management systems. Decision support systems. Trading systems. Field service support systems. Scheduling, packing, routing systems.

Now everything has an ui, and data innies and outies, but gosh! That's just connectors to the diamond!