Amazon.com: TRENDnet 4-Port USB KVM Switch Kit, VGA and USB Connections, 2048 x 1536 Resolution, Cabling Included, Control Up to 4 Computers, Compliant with Window, Linux, and Mac OS, Black, TK-407K :
DKVM-4U 4-Port USB KVM Switch | D-Link España
Startech .com 4-Port HDMI KVM SwitchBuilt-in USB 3.0 Hub for Peripheral Devices1080pControl four HDMI computers using a single conso... SV431HDU3A2 - Corporate Armor
Amazon.com: VGA KVM Switch 4 Port, USB VGA KVM Switcher for 4 Computers Share 1 Monitor 3 USB Devices Keyboard Mouse Scanner Printer, Including 4 KVM Cables & Desktop Control : Electronics