Business Calendar - Powerful and easy to use calendar app for Android including weather, widgets and tasks.
Fantastical 2 - Fantastical, the Mac calendar app you'll enjoy using. Quickly create new events with natural language input and more.
24me - Next Generation Personal Assistant
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Calvetica - The fast calendar for iPhone. Add an event in just two quick taps.
Morgen.so - All-in-one Calendar, Tasks & Scheduler. Morgen is the single hub for everything that revolves around time management.