I use to run ZoneMinder on an old PC, but it was a bit flakey, way too crazy to set up for a home system; I had learned how to config and admin it over the last several years, but I was just plain tired of it. It's another great system for security cameras, but not really for a home, unless you have a ton of cameras that need monitoring, and don't mind the dedication of a beefy machine to the task.

MotionEye OS is more a distributed solution. It is possible to set it up so one install can monitor multiple cameras (in some manner - I haven't played with it), but I like it as a simple single IP camera turn-key solution. It basically can turn a Rasperry Pi into a cheap wireless IP camera that isn't locked down or tied to a proprietary ($) cloud system.

Using a RasPi Zero W and the cheapest camera you can find, you can build such a camera for under $50.00 USD off Amazon; probably cheaper if you shop around a bit more. The only cheaper option I've found (but it takes more to set it up properly) is the ESP32 camera modules that you can get.