Headspace - Meditation made simple. Brilliant things happen in calm minds.
Detox for Facebook - Replace your Facebook feed with PH, HN, DN and more.
Calm - Calm.com can help you reduce stress and increase calm.
Focus - New Tab page that gives you a moment of calm and inspires you to be more productive.
Plum Village - Free mindfulness app w/ Zen Buddhist meditations + teachings
FriendFilter - Auto unfriend tool for Facebook