Awesome Cal - Awesome Cal is a Calendar application for your iPhone that you can take anywhere and keep close by to monitor all the upcoming birthdays, festivities, meetings, and more from a single place.
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Fantastical 2 - Fantastical, the Mac calendar app you'll enjoy using. Quickly create new events with natural language input and more.
Notability - Combine handwriting, photos and typing in a single note to bring your projects to life. Use a wide range of note-taking and sketching tools to capture every detail. You can even add and annotate PDFs in Notability.
Pocket Informant - Pocket Informant is the Best Calendar app for mac and iOS. Pocket Informant for iOS, Mac desktop, and Android.
AstraCollab - Build a better freelancer to client relationship