There are a few, like this add-on for PiKVM[1], a fully integrated version from Geekworm[2], and an as-yet unreleased 4-port IP KVM switcher from GL-iNet[3].

[1] https://technotim.com/posts/pikvm-at-scale/

[2] https://geekworm.com/products/pikvm-x680

[3] https://www.gl-inet.com/products/gl-rm4pe/