You can use the carton headsets as an ultra-low-budget entry to VR to this day, and they're compatible with almost any regularly shaped phone on the market.Google has now open-sourced the underlying VR SDK which will allow interested developers to create their own VR experiences on Cardboard viewers and improve and enhance the project as they see fit.
Google says that it still wants to contribute to the project and plans to release a Unity SDK package, but it hasn't actively developed the Google VR SDK for some time already.
Open-sourcing the project to keep it alive is a better move than just shuttering it altogether, and it's in line with Google's vision for the platform.
The VR headset's hardware specifications have been open-sourced a long time ago, allowing third-party manufacturers to create their own Cardboards.
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