Free calendar software for linux

Mozilla Sunbird Project is a redesign of the Calendar component. Our goal is to produce a cross platform standalone calendar application based on Mozillas XUL user interface language. At the moment the Sunbird name is a project name. It is not official and may change in the future.

Our intended user is someone who uses Mozilla Firefox and Mozilla Thunderbird and wants a calendar application based on Mozilla.

In addition, by focusing solely on standalone Calendar, we believe we can make some dents in the overall footprint and performance of the Calendar application by removing components and chrome we dont need.

Sunbird is licensed under the MPL/GPL/LGPL triple license, allowing use of the files under the terms of any one of the Mozilla Public License, version 1.1 (MPL), the GNU General Public License, version 2 or later (GPL), or the GNU Lesser General Public License, version 2.1 or later (LGPL)

Kronolith is the Horde calendar application. It provides a stable and featureful individual calendar system for every Horde user, with integrated collaboration/scheduling features. It makes extensive use of the Horde Framework to provide integration with other applications.

Right now, Kronolith implements a solid, stand-alone calendar system, allowing repeating events, all-day events, custom fields, keywords, shared calendars, iCalendar support, generation of free/busy information, and managing multiple users through Horde Authentication.

The calendar API that Kronolith uses is abstracted such that it could work with any backend, but right now we provide SQL (abstracted to support most databases, including MySQL, PostgreSQL, Oracle, and MSSQL via PEAR DB), MCAL, and Kolab backend libraries.

Periodic Calendar is a GUI utility which assists in women menstrual cycles tracking and fertility periods prediction.

The information tracked by this application can be used either to became pregnant or to prevent pregnancy.

At this point the fertility prediction is based on the calendar method which is not very precise. It is not recommended to use this method alone for the birth control.

Active Calendar is PHP Class, that generates calendars (month or year view) as a HTML Table (XHTML-Valid). Active Calendars source code is free.
You can modify or pass it on under the conditions of the GNU Lesser General Public License, published by the Free Software Foundation.
The calendars created by this class:
can be static (without any links)
can optionally have navigation controls
can optionally have a date picker control
can optionally have linkable days (url or javascript)
can optionally have event days with event links and own layout
can optionally have event content with links and own layout
support different GMT zones for the current date calculation
support month and day names, depending on your language
can be configured using CSS
do not require Javascript to be displayed or navigated (server side generation)
can be generated with just 2-3 lines of code
Active Calendar is based on the PHP native date functions (default) and supports optionally the ADOdb Date Library. Supported dates (on systems using a 32-bit signed integer Unix time_t):
Using PHP native date functions: 1902 - 2037 (UNIX) and 1971 - 2037 (Windows)
Using ADOdb Date Library: 100 - 3000 and later [ limited by the computation time of adodb_mktime() ] on both UNIX and Windows. To use the ADOdb Date Library just include it in your scripts. The Active Calendar class will use the library functions automatically.
Enhancements:
- An activeCalendarWeek subclass was added.
- The class can generate week calendars (one or multiple rows) according to the date or the week number of the year passed to the class using two public methods, showWeeks() and showWeeksByID().
- The structure of the download package was updated and an example was added for demonstrating how the Active Calendar can be used as a popup date selector in a form.

Unimaginatively-named Calendar project began out of frustration with other web-based calendar tools inability to display a readable calendar format. Unimaginatively-named Calendar was very much a project to "scratch an itch" -- to meet an immediate need that the author had. Since then, it has evolved considerably into a very useful tool that produces prettier calendars than those printed by most organizer software.
The first version of this software was written in ASP (VBScript) and ran on IIS 4.0 or higher with a database on SQL Server 7.0 or higher. It has since been completely rewritten in Java to run on Tomcat 5.5 or higher with a database on MySQL 3.3 or higher. The feature set is largely the same, though the two versions have no code in common.
Main features:
- The entire calendar is rendered in HTML -- no Flash or Java is used.
- Single-day, multi-day and occassional events are all supported. "Occasional" events are those events that occur multiple times but dont necessarily follow a regular pattern.
- Repeating events are supported and can repeat on a daily, weekly, monthly or yearly basis.
- Events may be categorized for easy administration.
- Nearly everything about the display is themable -- colors, fonts, border styles, first day of the week, weekday column widths, categories, etc.
- A calendar may be setup as a "private" calendar, so the user must be logged in to see it.
- Apple iCal and Mozilla Sunbird users can subscribe to the calendar with one click.
- NEW! The admin tool is password protected!

Hebrew Calendar is a GTK class which shows the Hebrew dates and holydays and their corresponding Gregorian date. Hebrew Calendar is based on the GTK toolkit and it can be integrated in any piece of GTK software.

The dates convertor is a C++ class written by Nachum Dershowitz and Edward M. Reingold, and available in the Public Domain. There is also support for libhdate which is an open source hebrew to gregorian date library available in debian hebrew packages.

NetCalendar is a network capable and mostly UNIX /usr/bin/calendar database compatible Calendar application programmed in Java.

NetCalendars initial motivaion was a programming project at the Aachen University of Applied Sciences for the object oriented programming class. But it became much more than just that!

Gcal is a program for calculating and printing calendars. It displays hybrid and proleptic Julian and Gregorian calendar sheets, respectively for one month, three months, or a whole year.
It also displays eternal holiday lists for many countries around the globe, and features a very powerful creation of fixed date liststhat can be used for reminding purposes. Gcal can calculate various astronomical data and times of the Sun and the Moon for pleasure at any location, precisely enough for most civil purposes.
Gcal supports some other calendar systems, for example, the Chinese and Japanese calendars, the Hebrew calendar, and the civil Islamic calendar, too.
English user manual included; German user manual included.
Main features:
- Some special calendar sheet formats.
- Calendar sheets can be provided with week numbers.
- Variable number of year calendar sheet blocks.
- Adjustable ordering of displayed dates.
- Adjustable period of Gregorian Reformation.
- Proleptic Julian and Gregorian calendars.
- Adjustable highlighting of holidays and actual day.
- Variable starting day of week.
- Output of day-of-year numbers and concatenated day and day-of-year numbers.
- Allows user-defined ordering of the date elements.
- Output of fiscal years.
- Output of lists or ranges of months or years.
- Sorted output of selectable country/territory specific eternal holiday lists (mostly complete) for nearly *all* countries around the globe, which are generated automatically.
- Sorted output of Christian Western churches calendar holidays, Orthodox Christian Eastern churches old and new calendar holidays, Hebrew calendar holidays, Islamic civil calendar holidays (since AD 622), Persian "Jalaali" calendar holidays, Chinese and Japanese calendar holidays (since AD 1645), more "other" calendar system holidays, multicultural New Years Days, and start of "other" calendar system months, which are also generated automatically.
- Sorted output of fixed date lists which can be defined and created in a highly flexible manner.
- Allows filtration of fixed dates by using regular expressions and other built-in methods.
- Allows the use of date and text variables and basic operations on them.
- Some gimmicks like solar and lunar eclipse time, sunrise/sunset plus a lot of other Sun based data and times, Moon phase, Full and New Moon time, moonrise/moonset plus a lot of other Moon based data and times, zodiacal markers, equinox and solstice, air line distance between two geographic point locations plus course angles, biorhythm et cetera...
- Fixed dates can be stored in several files.
- Nearly unlimited nesting level of include files.
- Nearly unlimited internal text and table lengths.
- Default options can be stored in the `GCAL environment variable.
- Options and commands stored in response files can be preloaded.
- Uses either an external pager or a simple built-in pager.
- Detailed Texinfo reference manual.
- German, English and American program version by default.
- Supports various computer platforms.
- GNU `gettext internationalization technology, which allows the use of message catalogs for most native languages.
- GNU `autoconf(iguration) installation technology.
- Supports both UN*X short-style options and GNU long-style options.