Question [Q] 3rd-party apps using Duo Camera / Dual Lens SDK?

Back when the M8 was launched, HTC made a big deal about providing a Dual Lens SDK so that 3rd-party apps could utilize the Duo Camera. I dunno, I guess I was expecting 3rd party camera apps might use it for light metering or infrared-style effects or perhaps just better exposure control, but I've seen zilch since then. Does anyone know of any 3rd-party apps that use the Dual Lens SDK?