Ok, a side project of mine, Prana, is live on Kickstarter: http://kck.st/1MDvCpT
I'm super excited to finally have a tool to support using breathing techniques (and posture) to improve health and well-being. I've recommended specific breathing patterns to patients (and family) for years - it's amazingly effective for stress reduction, improving focus or energy, and many other applications. But implementation and encouragement have been difficult, since not everyone has access to a private Ayengar yoga teacher. So i've been lucky to help guide development of a device that meets my own needs and specifications.
And it'll augment an Apple Watch nicely, since you can't track breathing from the wrist. ;-)