Orage
Orage is a new modern calendar application for the Xfce Desktop Environment.
21 Alternatives To Orage
Apple Mail
There’s big news attached.
Calcurse
Calcurse is a calendar and scheduling application for the command line.
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.
Cozi
Cozi | Must-have app for the modern family
Etar
Material design open source calendar for Android.
GMinder
GMinder is an open source Windows System Tray app that pops up to remind you about Google Calendar events.
GNOME Calendar
GNOME Calendar is a simple and beautiful calendar application designed to perfectly fit the GNOME…
Google Calendar
Spend less time managing your day & more time enjoying it
Lightning Calendar
Organize your life — it’s about time!
Nextcloud Calendar
The Calendar app is a user interface for Nextcloud’s CalDAV server.
Outlook
Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Rainlendar
Rainlendar - Customizable desktop calendar
Remember The Milk
Remember The Milk is a task and time management application for mobile devices.
SSuite My Calendar Diary
A portable calendar and diary for people on the move…
Simple Calendar
A simple calendar with events (optional recurring and reminders), week numbers and a customizable…
TiddlyWiki
TiddlyWiki — a non-linear personal web notebook
Todoist
Todoist is a to-do list that helps you get organized, at work and in life.
UKs Kalender
This program helps you organizing your dates and tasks and reminds you of upcoming events.
VueMinder Calendar
Take control of your schedule and get reminded wherever and however you want.
aCalendar
TAPIRapps. aCalendar and aCalendar+ for Android. The fastest Android calendar.
eM Client
eM Client is a Windows-based email client for sending and receiving emails, and managing calendars, contacts and tasks.