Barrier is not developed any further at the moment. People who contributed to it now are flocking around input-leap. Waynergy was more like a workaround until libei was in better shape, I am not sure if this will continue as a project, now that there's a more defined way to do this kind of thing on wayland.
So, my money is on input-leap. I'm running it on Fedora 39 on wayland right now. It's not perfect, but at least it's working again.