The Samsung SRD-442 is a great hard disk recorder/CCTV system. Now discontinued, these units can be picked up for a good price.
There is a mobile app (iPolis) which Samsung have released to interface with these CCTV units from iOS and Android devices. However, the desktop (web) application is somewhat dated. This web application requires a number of plugins which means it only works on Windows devices (7/10 etc) and not on Mac OS X. (more…)