Well, there's always Unreal, Godot, and Unity. Ambient is something very different and takes advantage of WebGPU and WebASM to deliver a networked 3D gaming experience in the browser. IMO this is a fantastic example of what our whole internet is only just now capable of in a nice little package. Sure both Unreal and Unity will export to web, but there's a whole lot in between loading one of those up and shipping it.

You should try out the Ambient quickstart. You won't regret it.