Visitor Management Systems (as opposed to Video Surveillance Systems, which should be VSS, not VMS), what do not people use or recommend these days. There's the old players of Easy Lobby and STOPWare, but a lot of cloud based startups, too. Do you use different products depending on if it is residential or a business? Or based if it has integration with your Access Control System?
Visitor management seems to be a logical extension of access control, but it amazes me no access control developer has a real and robust visitor orientated system that I know of.