At a Wednesday morning developer session at this year’s WWDC, Apple said that HomeKit is now open to any Apple developer to tinker around with. Developers no longer have to get an MFi license to start controlling prototypes of smart home gadgets. They can even develop prototypes on top of popular developer boards like Raspberry Pi and Arduino. But once these developers want to bring a product out commercially, they still have to go through MFi certification. Nevertheless, this should make it easier for developers to start building HomeKit products.