Google Calendar - Spend less time managing your day & more time enjoying it
Mixmax Calendar - The fastest way to schedule meetings with anyone, anywhere
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
Clean Google Calendar - Makes Google Calendar look nicer & launches as a desktop 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.
Sunsama - Calendar and scheduling for teams