content: I mentioned earlier, there really isn't anything proprietary about their interface. The SDK is just Unity and some libraries, IIRC. Anybody can just make stuff for the Rift, they just may not be able to publish it to their app store. It's not like early Android an iPhones where the only way to install software is through their app store, it's more like todays phones where you can just get the apk and put it on your phone. I almost wonder how long it'll be before an f.droid-like store for the Rift appears for this kind of fringe stuff.