Typefully - Write & publish great tweets, without distractions
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.
Refined Twitter - A browser extension that improves the Twitter experience
TimeFlip - Human-friendly time tracker
Minimal Twitter - A distraction-free browsing experience for the new Twitter
Focus - New Tab page that gives you a moment of calm and inspires you to be more productive.