Google Calendar - Spend less time managing your day & more time enjoying it
Vimcal - Vimcal is the world’s fastest calendar, beautifully designed for people who work remotely and live in their calendars.
Mixmax Calendar - The fastest way to schedule meetings with anyone, anywhere
Clean Google Calendar - Makes Google Calendar look nicer & launches as a desktop app
Sunsama - Calendar and scheduling for teams
Plan - Plan is a better way to organize.