Amazon.com: KVM Switch with Serial Port Control, 4K@60Hz 4 in 1 Out HDMI KVM Switcher Box for Share Mouse Keyboard and Monitor, Can Work with Pi-kvm, Compatible with Windows/Linux/Mac System : Electronics
USB 3.0 KVM Switch HDMI 2 Ports Support 4K@60HZ Analog HDMI USB Switch for Mac | eBay
USB VGA KVM Switch for 2 PC Sharing 1 Video Monitor and 3 USB Devices, Keyboard Mouse Scanner Printer, for Laptop PC Windows Mac OS System KVM Cables - Newegg.com