Yes. It's a Windows application for engineers. Price is a few hundred dollars per seat. The support load is pretty stable. People often have a few issues at fir

Yes. It's a Windows application for engineers. Price is a few hundred dollars per seat. The support load is pretty stable. People often have a few issues at first or when trying to do something novel, then they're fine. They have to update it themselves and occasionally I'll hear from a customer still using a 10 year old version but usually when they ask for help, they're already on the latest version, somehow. Nobody has complained that it doesn't auto-update or nag them. I make about the same money as a regular job. All my customers are extremely pleasant to deal with. You hear horror stories about angry or entitled customers but mine are always polite and respectful. When something doesn't work right, they often act like it's their own fault. Even when they want a refund because they don't like it, they ask nicely. I suppose they know I'm a one-man-band so their expectations are a bit lower than for a giant company. But also, engineers don't seem to be dickheads generally, at least not when they're at work.