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