Reolink, Ubiquiti, Dahua, Amcrest, and Wyze. Nice thing about a third-party NVR is you can mix and match whatever is cheapest or best for a given spot. I’m currently using iSpy Agent for the NVR as it’s runs nicely in docker. Then I layer Codeproject.AI over top for person detection rather than just generic motion alerts. I’m using a 2090 Ti GPU (which is WAY overkill but I got it for free) to make the AI detection very fast.