Since I switched to Wayland, I could not find an alternative for barrier that I used under X. After a lot of search I bumped into a project called rkvm. You can check it out. It is a bit more difficult to setup than barrier but it works pretty well for me.

The only bad thing is that both computers must run linux.

Imagine if NixOS had as good a wiki as Arch. Personally, I wouldn't bother with another distribution again.

It's not about secrecy. It's about privacy.