Can you say 'world's shortest list'? :)
On the VMS side, there is Zoneminder (Linux) and iSpy (Windows / freemium).
On the access control side, I don't think there is any.
Thanks John, why do you think this list is so short?
New addition to open source VMS: OpenCVR, under active development, looks promising.
Aside from a the visual tree view control and admin panel similarity there are numerous profound differences in the makeup of OpenCVR and Exacq. Open CVR is closer to DW-Spectrum / NetworkOptix, owing to the developers use of QT5 than it is to Exacq which is authored using WX Widgets framework.
OpenCVR is likely the only cross-platform VMS that seeks to exploit the advantages of HDFS and Hadoop MapReduce.
"Hadoop MapReduce is a software framework for easily writing applications which process vast amounts of data (multi-terabyte data-sets) in-parallel on large clusters (thousands of nodes) of commodity hardware in a reliable, fault-tolerant manner."