Fine Mechanics has ZenClock (iTunes Link) for the iPhone and iPod Touch and ZenClock HD (iTunes Link) for the iPad in the iTunes App Store for FREE for a limited time.

ZenClock HD is a fully functional multiplatform meditation exercises helper. Includes full set of essential settings for breathing cycle, timer, and log. Implements several unique features, such as group meditations, beginners’ guide etc. All in all, about 100 features.