fruux - Free service that takes care of your contacts, calendars and more so you don't have to.
Google Calendar - Spend less time managing your day & more time enjoying it
FullContact - Put the power of full contact information into your web or mobile apps.
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
Google Contacts - Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.
Lightning Calendar - Organize your life — it’s about time!