Apache Karaf with OSGi works pretty nice using annotation based dependency injection with the declarative services, removing the need to mess with those hopefully archaic XML blueprints. Too bad it's not as trendy as spring and the developers so many of the tutorials can be a bit dated and hard to find. Karaf also supports many other frameworks and programming models as well and there's even Red Hat supported... Source: about 3 years ago

I cannot tackle every existing or existed device, sorry. You cannot find here products aimed at enterprises and professionals, like the StarVROne, the Varjo VR-3 or the XTAL. For historical reasons, let me mention on the fly the first pioneering headset implementing eye tracking and foveated rendering, the FOVE 0, by Japanese company Fove. Initially welcomed by a successful international kickstarter campaign in... Source: about 3 years ago