While all the geeks are pleased with Google Glass, Brilliant Service, a Japanese company has created a glass optimized FreeBSD derivate, called Viking OS.
Viking OS uses Objective-C programming because it’s “elegant, fun, and easy to program in”, as the developers said. Back in February of the current year, the glass OS was capable of providing only the basic phone functions, but it may have been improved since then.
Brilliant Service does not create any hardware or glasses, it only provides the software. When the wearable devices will gain better popularity, Viking OS may be a good choice.
Personally, I find it awkward to wave my hands in order to answer a phone call, but this may be awesome for gaming and other entertaining apps.