Kin Calendar - The simple and connected calendar
24me - Next Generation Personal Assistant
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WeekCalendar - WeekCalendar is an all-in-one calendar application designed to provide everyone with all the features they need to work to their fullest.
Sunsama - Calendar and scheduling for teams
Pocket Informant - Pocket Informant is the Best Calendar app for mac and iOS. Pocket Informant for iOS, Mac desktop, and Android.