This project is a 4 port HDMI KVM Switch. It is powered by a 5V micro USB connection.
Total material cost is ~$60 at the time of writing (9/16/22).
The design was created using Altium Designer, although I've made sure to include the project outputs in the repo so those without Altium can still manufacture this.
Originally, there was meant to be a 4 port USB KVM included. I gave up on the USB functionality, as it will be more expensive than a cheap 4:2 KVM on Amazon (~$20 USD at the time of writing, example here).