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IPMI / KVM solution for consumer hardware
(alien.top)
Regarding the ASRock Paul, theres a lenghty discussion on the Level1 Tech Forums: https://forum.level1techs.com/t/asrock-rack-introduces-the-paul-an-ipmi-pcie-card/162977/74?page=6
Intel AMT
If, your hardware supports Intel vPRO / AMT (Half of my optiplexes did, as did my HP z240s).... That is a built-in hardware KVM.
MeshCommander can expose this is a nice way -> https://www.meshcommander.com/meshcommander
ESXi ???
Not conventional KVM. But, think about it... Screen View/Control, Power Control, and more.
Pikvm, or blikvm