I actually just made it up. Companies that come to mind are Scale.ai (doing data labelling stuff for ML that historically would have been done by outsourcing companies, etc), Flexport (freight forwarding, traditionally done via spreadsheets and emails), Checkr (background checks), Atrium (legal services), Oscar/Clover (health insurance), Cadre (real estate investing). There are tons and tons of them in the recruiting (really sourcing) space too: I'd say Triplebyte is an Ops Plus company, as is Sourceress and a couple more.