Headspace is a free 10 day introduction to meditation. It eases you into meditating on your own through guided meditation. I have been using the iPhone app and I’ve loved it. It makes getting in the habit of meditating easy.
Stop Breathe & Think App is a free app with a selection of guided meditations. I’ve tried some of the free meditations and really liked them. They also have meditations that you can purchase in-app.