Samsung and the Tizen Association recently made the Tizen Software Development Kit for Wearables available from the Tizen developer web site. The SDK supports any wearable running Samsung's Tizen operating system, but that's an extremely limited number of devices at the moment, with just the Samsung Gear 2 and Gear 2 Neo smartwatches filling the space.
Two days, a room full of hackers and one theme: music. This is the premise behind the Stockholm Music Hack Day, which resulted in 31 projects including hardware hacks, mobile, web and desktop applications. A number of the web applications are live and available for anyone to use.