best cctv recording software

[xRascal]

hi guys i got couple off spare servers for my cctv setup wanting to know some good cctv recording software what people recommend due to the dvr boxes what come with the cctv is  not that good 

[Fireblade1k]

I like blue iris

[iHack]

I like the idea of a linux based CCTV system rather than a Windows based OS because I imagine it would more secure.

I found this, looks pretty cool:

https://zoneminder.com/

It supports IP cameras, Analogue cameras and webcams.. I think it also supports RS232 & RS485 along with I/O pci cards. 

Here is a list of it's features and functionality:

http://www.tuxradar.com/content/build-your-own-surveillance-zoneminder

I haven't used this OS but if anyone has please comment on it..