Company Eduard Reuvers created these great apps:
Apanaka, Buteyko Breathing, Buteyko, Apanaka Yoga, Buteyko Pro, Buteyko Breathing Pro, Breath Meditation, Reiki, Reiki Pro, Buteyko Breathing Free, Apanaka Brainwave, Brainwave Breathing Pro, Buteyko Pro with Brainwaves, Brainwave Breathing, I Can Hold My Breath, Advanced Buteyko, OxyInside, Breathing Challenge, 30 Day Breathing Challenge, and others..