Insight Timer - Support your meditation practice through a massive community powered app.
Plum Village - Free mindfulness app w/ Zen Buddhist meditations + teachings
Headspace - Meditation made simple. Brilliant things happen in calm minds.
Meditation Timer - Focus on meditation without thinking about the time.
Calm - Calm.com can help you reduce stress and increase calm.
Pixel Thoughts - 60 second meditation tool to clear your mind