How other companies worked with VR cardboard
Since the creation and release of Google Cardboard, many companies across the world have worked with this license, and also developed their own products. Some working with cardboard, and also other materials like plastic, and adding a big range of accessories to complement the experience.
One of those companies is Knoxlabs (https://www.knoxlabs.com/), one of our great colleagues in the VR world. They commercialise custom branded VR cardboard viewers, as well as more high end plastic products such as Oculus or HTC Vive. They are one of the few companies that currently offer both options for a wider range of budgets.
And on the other end there are companies who work exclusively with harder materials for the headsets such as plastic, and do not offer the opportunity to customise them, such is the case of Oculus, HTC Vive and Playstation among others. The later headsets also work only mostly for gaming, leaving behind other possibilities such as education.