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Typically when they do, they're built in to server chassis as a remote management/LOM tool. A few such add-on cards have been made over the years, though -- the PC Weasel 2000 was quite a nice card back in the day: https://web.archive.org/web/20110406024209/http://www.realwe...

Others like the Enidan J1 were specifically targeted toward people building clusters out of commodity hardware: https://web.archive.org/web/20010511215150/http://www.enidan...

Lots of server IPMI interfaces do this. IDK of an add-on card for old computers though...

Not a video card, and HDMI instead of VGA, but I came across these recently:

- https://pikvm.org/

- https://mtlynch.io/tinypilot/

For PCIe there are such things for remote control of servers. (A lot of them are specific to manufacturers and won't work in other systems, but not all) E.g. Asrock Rack makes one called "PAUL".