Calcurse

Calcurse is a calendar and scheduling application for the command line.

21 Alternatives To Calcurse

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Apple Mail

There’s big news attached.
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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.

DayTasks

Minimal todo.txt-compatible app for Ubuntu.
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GMinder

GMinder is an open source Windows System Tray app that pops up to remind you about Google Calendar events.
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GNOME Calendar

GNOME Calendar is a simple and beautiful calendar application designed to perfectly fit the GNOME…
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Getting Things GNOME

Getting Things Gnome! is an organizer for the GNOME desktop environment.

Gnome To Do

GNOME To Do is a simplistic personal task manager designed to perfectly fit the GNOME desktop.
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Google Calendar

Spend less time managing your day & more time enjoying it

LightWave 3D

LightWave 3D combines a state-of-the-art renderer with powerful, intuitive modeling, and animation tools.

Lightning Calendar

Organize your life — it’s about time!
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Markor

Text editor - Notes, ToDo & Bookmarks. Markdown and todo.txt support.

Maya

Maya in Launchpad

Nozbe

Nozbe - to-do, task, project and time management productivity gtd getting things done online application with software for Apple iPhone iPad Android Mac Windows Linux

Org mode

Org: an Emacs Mode for Notes, Planning, and Authoring

QOwnNotes

QOwnNotes is a free plain-text notepad with markdown support for Linux, Mac OS X and Windows, that works together with ownCloud Notes.

Rainlendar

Rainlendar - Customizable desktop calendar

Remember The Milk

Remember The Milk is a task and time management application for mobile devices.

Simple Calendar

A simple calendar with events (optional recurring and reminders), week numbers and a customizable…

Todo

Todo is a to-do and task list app.
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Todoist

Todoist is a to-do list that helps you get organized, at work and in life.

VueMinder Calendar

Take control of your schedule and get reminded wherever and however you want.