On-Call Schedule - Quickly update your on-call schedule on Google Calendar
Vimcal - Vimcal is the world’s fastest calendar, beautifully designed for people who work remotely and live in their calendars.
Fantastical 2 - Fantastical, the Mac calendar app you'll enjoy using. Quickly create new events with natural language input and more.
Button for Google Calendar™ - See your daily schedule and join meetings in one-click.
Cron - Cron Calendar.
Dawn Calendar - AI calendar scheduling tool