Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Fantastical 2 - Fantastical, the Mac calendar app you'll enjoy using. Quickly create new events with natural language input and more.
Wiplo - The easiest way to organize and run your business workflows.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Toby - Better Than Bookmarks
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...