Any good free/open source nvr software

[BiGKaT 0]

I just ended up ordering a ZyXEL ptz camera for installation on a porch. The sample video on youtube looked ok and it will do , at the very least for a temporary solution to a neighbor problem at my sisters. Since I can't get there for a while this is a wireless camera so I can always use teamviewer to set it up for her.

Is there any good open source nvr software. I figure I need about a weeks worth of recording at a time before data is overwritten. I think she has enough HD space for this.

I have seen good reviews for blue iris, but are there any similar software solutions that are free?