AnySoftKeyboard - Android (f/w 1.5+) on-screen keyboard for multiple languages.
Headspace - Meditation made simple. Brilliant things happen in calm minds.
Gboard - Google-powered keyboard with search, GIFs, emojis and more!
Calm - Calm.com can help you reduce stress and increase calm.
Hacker's Keyboard - Are you missing the key layout you're used to from your computer when using an Android device?
Medito - 100% Free Meditation App that will improve your Mental wellbeing with the help of Guided Meditations, Breathing Exercises, Mindfulness Practices, Relaxing Sounds, and more.