Open source solutions for a home security camera system
Free (almost) ways to use an old computer as your home or small business video surveillance system.
You’ll need to purchase some network cameras of course, as well as cables (unless the cameras are wireless) and then you’ll need to mount them or pay someone to mount them for you, but this software will allow you to use a computer as your DVR to record the video feeds.
Here’s a few (some not open source):
There are plenty more, but they are not free.