What software are RV parks using to keep track of things?

My former son-in-law built a small RV park and learned there are many software packages out there for sale. He picked one that lets the camper pick the spot. That's the kind of software I like. Our go-to park in San Diego is Chula Vista. For years you were at the mercy of whoever was working the desk at check-in. Not what you'd expect for a $100 a night park. They have new owners now and have gone to the pick-your-space software, which is absolutely terrific.