Focus - New Tab page that gives you a moment of calm and inspires you to be more productive.
Workona - A better way to work in the browser.
UnDistracted App - Use social media in a useful way. Control Facebook, YouTube, Twitter, Reddit, Netflix and LinkedIn in a responsible way.
Session Buddy - Manage Your Browser Sessions
Deprocrastination.co - Turn your browser into a calm, lean productivity machine
Toby - Better Than Bookmarks