Listr - Listr lets you explore some of the best lists on Twitter, curated across your favorite categories.
Headspace - Meditation made simple. Brilliant things happen in calm minds.
Refined Twitter - A browser extension that improves the Twitter experience
Plum Village - Free mindfulness app w/ Zen Buddhist meditations + teachings
Blindfold - Make your life on Twitter more positive
Calm - Calm.com can help you reduce stress and increase calm.