Inbox When Ready - Protect your focus... hide your Gmail inbox by default
Moodly - Get a better sense of focus and relaxation by listening to ambient nature sounds.
Snailbox - Schedule your email at specific times and recover the time you're losing to your inbox.
Focus - New Tab page that gives you a moment of calm and inspires you to be more productive.
Ugly Email for FireFox - Get back your email privacy, block email tracking
Neurosity - The wearable that translates thought into action