Cron - Cron Calendar.
FOVE - An eye tracking virtual reality headset (pre-launch)
zcal - zcal is the fastest way to schedule every meeting for Free and make it personal.
WebGazer.js - Eye tracking on the browser
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.
Breaks For Eyes - A Mac app to get rid of eye strain, dry eyes and fatigue