motionEyeOS - A Video Surveillance OS For Single-board Computers
ZoneMinder - ZoneMinder is a free and open-source piece of security software that can be used at home or in your business. The software puts you in control of all of your data, and it is exceptionally easy to setup. Read more about ZoneMinder.
iSpy - iSpy is software that allows the user to view and control video surveillance cameras. The software began development in 2007 and now has over 2 million users around the world, according to the software's website. Read more about iSpy.
Securityspy - SecuritySpy is a multi-camera video surveillance application for the Macintosh.
MotionEye - motionEye is a web frontend for the motion daemon, written in Python.
Unifi Video - Unifi Video by Ubiquity is designed specifically around Ubiquiti range of cameras and is free.