Lightning Calendar - Organize your life — it’s about time!
Pimero - Pimero 2009 enables you to manage your appointments, contacts, tasks and notes.
Google Calendar - Spend less time managing your day & more time enjoying it
EssentialPIM - EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
Notezilla - Colorful & powerful sticky notes app for Windows & Phones.