Not sure if you would count that as greenfield projects (I would not), but I am told they make very good database and ERP servers. Our local utility runs the DB

Not sure if you would count that as greenfield projects (I would not), but I am told they make very good database and ERP servers. Our local utility runs the DB2 backend for their SAP installation on a (small-ish) mainframe. I remember hearing a while back (~10 years) that IBM and SAP were giving fairly generous discounts for customers to move their SAP installations to GNU/Linux running on zSeries mainframes. None of that is very buzzwordy, but putting such mission-critical software on a mainframe can make sense at a certain scale.