Focus - New Tab page that gives you a moment of calm and inspires you to be more productive.
Taskful - Deadlines, meet your match.
UnDistracted App - Use social media in a useful way. Control Facebook, YouTube, Twitter, Reddit, Netflix and LinkedIn in a responsible way.
Calendarist - Time blocking companion for Google Calendar
Deprocrastination.co - Turn your browser into a calm, lean productivity machine
Gone - An ephemeral to-do list