Meta is opening up its Meta Horizon OS to third-party hardware makers, allowing them to build their own devices that run on the operating system. This move aims to create a more open ecosystem for mixed reality, giving consumers more choice and developers a larger platform to build for. The OS will be used by leading technology companies such as ASUS and Lenovo to develop new devices. The goal is to create a common platform for mixed reality, similar to the PC and smartphone industries.