I currently work or have worked on the following projects:
I currently work on BlueZ (Bluetooth stack for Linux) helping implement support for the new Bluetooth Low Energy (LE) technology. We currently lack user applications that take advantage of the recently adopted GATT profiles, such as Proximity & FindMe. With these profiles, we will be able, for example, to alert if the phone has been left behind (assuming you own a LE keyfob with you) or locate your keys (if they have a LE keyfob/tag).
I intend to work on QML applications that will enable to use this technology. NOTE: N950 Bluetooth chipset lacks LE support, but N9 will be Bluetooth 4.0 based (according to specs). For testing and development purposes, the applications will use the traditional Bluetooth 2.1 technology.