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.

Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...

Apple Contacts App - Access and edit your contacts from personal, business, and other accounts with the Contacts app.

Calendar Lock PEA - Calendar Lock PEA is an encrypted desktop calendar with a day, week and month view. The shown calendars are never stored unencrypted on your disk, but exist only in the RAM. Platform-independent, Open Source, no installation or registration required.

Windows Contacts - Windows has many extraordinary organizers, and in the event that you include distributed storage, then you presumably have more.

SSuite My Calendar Diary - A portable calendar and diary for people on the move...