display-switch
Turn a $30 USB switch into a full-featured multi-monitor KVM switch
This utility watches for USB device connect/disconnect events and switches monitor inputs via DDC/CI. This turns a simple USB switch into a full-fledged KVM solution: press one button on your USB switch and all your monitors connect to a different input. It is supposed to be installed on all computers that could be connected to these monitors since the app only switches monitors "one way" and relies on itself running on the other computers to switch it "the other way" as needed.