Cron - Cron Calendar.
Focus - New Tab page that gives you a moment of calm and inspires you to be more productive.
zcal - zcal is the fastest way to schedule every meeting for Free and make it personal.
UnDistracted App - Use social media in a useful way. Control Facebook, YouTube, Twitter, Reddit, Netflix and LinkedIn in a responsible way.
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.
Deprocrastination.co - Turn your browser into a calm, lean productivity machine