GNOME Calendar
Lightning Calendar
Google Calendar
Simple Calendar
Rainlendar
Microsoft Outlook
Kontact - KOrganizer
VueMinder Calendar
Desktop Calendar
Lightning Calendar
Calendar Lock PEA
Simple Calendar
GMinder
UKs Kalender
SSuite My Calendar Diary
Reminder Commander
GNOME CalendarLightning Calendar - Organize your life — it’s about time!
Google Calendar - Spend less time managing your day & more time enjoying it
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.
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
Rainlendar - Rainlendar - Customizable desktop calendar
GMinder - GMinder is an open source Windows System Tray app that pops up to remind you about Google Calendar events.