Google Calendar - Spend less time managing your day & more time enjoying it
Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
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.
LockOnMe - LockOnMe is a location-sharing app, displaying targets and associated Points Of Interest on maps & fun radars.