Back in the late 90's, my friends dad had a small auto shop where they did oil changes, tune-ups etc. They wanted something that prints receipts, keeps track of sales, customers, inventory, prints reports on various things etc. So I wrote something in AmigaBASIC and "compiled it" with AC Basic (I think, dont remember if that was correct) that did just that. They ran it on an Amiga 2000 for a few years. I still have the source code also.. cool little piece of software.
EDIT: Changed ABasic to AC Basic..I think that was the compilers name.