Insight Timer: Has it all... guided, music, timer, nature sounds, themes. Free for a lot, some fees for extras if desired. Available for iPhone and Android.
The Mindfulness App: Timed, some guided (premium subscribers), reminders can be set and works with other heath apps. $9.99/mo with costlier options or $59.99/yr. Available for iPhone, iPad, and Android.
Headspace: 10 day free trial the $7.99/mo with costlier options. Available for iPad, iPhone, desktop, and Android.
10% Happier: For the skeptic. Based on neuroscience and omits spiritual components. Free and $7.99/mo options. Available for iPad, iPhone, and Android.
Calm: Guided topics. $12.99/mo or $60/yr. Available for iPad, iPhone, and Android.
Stop, Breathe, & Think: Encourages awareness of what is going on and how you are feeling in present moment. $6.99/mo for guided meditations. Available for iPad, iPhone, and Android.
Buddhify: No tie to Buddhism. Guided meditations. $2.99-$4.99. Available for iPhone and Android.
Smiling Mind: Age specific options for kids. Free. Available for iPad, iPhone, and Android.
OMG! I Can Meditate: Divided by interests/life events (one for chemo patients, weight loss). $7.42/ mo. Available for iPad, iPhone, and Android.
Omvana: Some free, some cost per track. Large variety. Available for iPhone and Android.
Equanimity: No guided, just timer with simple gong sounds to let you know when your meditation has finished. For for more experienced meditators. $4.99/mo. Available for iPhone.
WhiteNoise: No guided, just relaxing white noise. Some availability to create your own. Free. Available for iPhone and Android.
Breathe2Relax: Not meditation, but guides through breathing exercised to reduce stress. Free. Available for iPhone and Android.
My Mood Tracker: Not really a meditation app, but cues several times a day to be aware of how you are feeling, promoting consciousness throughout the day. $9.99. Available for iPhone.