Google Calendar Chrome Extension adds a button to your browser toolbar that displays a preview of your calendar while you're navigating. (works on any page). If you're on certain sites where it detects the presence of events, the icon changes to a green "+". Clicking that icon lets you add the event to your Google Calendar, and shows you a Map (if there's a location it could detect.) Supported sites include Facebook, Evite, and any site that uses the hCalendar microformat or derivative microformats such as hResume.
HordeZpush provides ActiveSync synchronisation between smartphones, PDAs, and Horde groupware. It is based on the Zpush project and adds backends that synchronize contacts and calendars with Horde. It has been tested with Horde 3.3.5, Kronolith 2.3.2, Turba 2.3.2, and Z-Push 1.2.1.
ITL itools is a collection of command line tools that mimics the development of the underlying ITL library (libitl) and is meant to always give the end-user simple means to access its functions. Available tools include ical (displays a Hijri calendar), idate (a multi-method Hijri/Gregorian date converter), ipraytime (a prayer times and Qibla calculator and schedule table generator), and ireminder (a prayer time reminder Perl script). This project is part of the Islamic Tools and Libraries project.
Easy Weekly Calendar is a PHP class that can be used to show calendar of a given week. It takes the day, month, and year of a given date and generates an HTML table with the days of the week of the given day. The class also generates links to browse to the previous and the next weeks.
The ApPHP Calendar (ApPHP CAL) is a powerful PHP calendar script that may be easily integrated and used with various PHP projects, such as schedulers, event processors etc. The calendar is very simple to install, implement, and use. It has a user-friendly interface and navigation. It can be viewed in various ways: yearly, monthly, weekly, and daily.
parsical is a Shehensai or parsi calendar application. It's useful for prayers, birthdays, weddings, navjotes, jashans, and other events. It features sunrise calculation based on the computer timezone (as roj begins at sunrise in this calendar), "previous" and "next" month and year buttons, conversion between Gregorian and Shehensai dates, and jumping to the calendar month on a given date or roj.