Christian Meditation and Prayer: Abide
Headspace one of the original mindfulness apps that started the industry.
Mindful breathing: Breathe2Relax
Ten Percent Happier one of the best with contributions by well-known leaders in the field.
Mindfulness: A practical guide to finding peace in a frantic world by
Prof Mark Williams & Dr Danny Penman. It includes a handy 8-week course. Download the eBook from the iTunes Book Store or Amazon. The eBook is the best resource as it contains sound clips for the meditation exercises.
The Mindful Day by Laurie Cameron