Some other NVR options

Other options I did some quick research on that people have mentioned to look at if Windows is a deal breaker for you to run Blue Iris.

Shinobi NVR software.

Facebook page

Here is their feature compare to ZoneMinder. Platform independent since written in JavaScript. Sounds like there are issues with libraries need to make it work under Linux.

Synology Surveillance Station

The licensing cost of ~$50 after the first 2 is going to be the deal breaker for most. Add to that a NAS just is not built for video display so you are left with browser display A quick Google would seem to indicate does not stand up performance wise either.