Calendar
Active Calendar is a PHP class that generates calendars (month or year view) as HTML tables (XHTML-Valid).
More Info 
Developer: giorgos
License: GNU Lesser General Public License (LGPL)
Operating System: All
CalendarX is a calendar application for Plone (http://plone.
Developer: CalendarX
License: GNU General Public License (GPL)
Operating System: Platform Independent
This is a very nice calendar that shows all dates between 1900 and 2100.
Developer: Steve S
License: GNU General Public License (GPL)
Operating System: Not Available
VCalendar (Virtual Calendar) is an open source Web calendar application with related tools,
for posting and maintaining events and schedules online, in calendar format.
Developer: Alexey Petrov
License: BSD License
Operating System: Win 98/XP/2000, Unix/Lynux
Gurt JavaScript Calendar is extremely fast, small cross-browser javascript control date entering.
Developer: Gurtom
License: GNU General Public License (GPL)
Operating System: all
Max's Calendar is an object oriented calendar script written in PHP.
Developer: PHP F1
License: GNU General Public License (GPL)
Operating System: ALL
Sprigst Calendar is very widely used free JavaScript Calendar control that makes it easy for your visitors to fill out the date fields by selecting the date from a calendar.
Developer: Sprigst
License: Free for non-commercial use
Operating System: Not Available
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.
Developer: Chara Miteo
License: GNU General Public License (GPL)
Operating System: Linux, Windows
Monthly Calendar that can be added to any html web page.
Developer: sithu
License: GNU General Public License (GPL)
Operating System: Not Available
This Event Calendar is adaptable to any industry, community or organization and provides a full grid calendar, list of daily events and detailed information per event.
Developer: Larry Gurreri
License: Freeware
Operating System: Linux, Unix, Windows
This is a stylish web calendar with events written in classic ASP.
Developer: TH
License: Freeware
Operating System: Linux, Unix, Windows
Organise your week with agenda-calendar.
Developer: Francisco Charrua
License: Freeware
Operating System: Windows
The event calendar has now been updated to allow multiple events per day, also these events can be categorised under unlimited categories.
Developer: http://www.asp-dev.com/c...
License: Freeware
Operating System: WIn 95/98/NT/2000/XP
Calendar is a multi-platform compatible calendar script that lets you choose a day, month, and year to view, and with some minor modification will even put your events onto the page on the proper days.
Developer: RF
License: Freeware
Operating System: Unix/Linux/Windows
Epoch JavaScript Calendar and DatePicker empowers the developer to quickly upgrade their users' web experience without spending hours developing complex date-validation scripts.
Developer: MeanFreePath
License: Freeware
Operating System: Linux, Unix, Windows
Easy to set up calendar script that overcomes most of the flaws of existing scripts (like the problem in IE that it gets overlapped by select-boxes).
Developer: Martijn Korse
License: Freeware
Operating System: Linux, Unix, Windows
Event Calendar is reusable PHP script extending the web site's functionality with event scheduler or news archive.
Developer: http://www.softcomplex.c...
License: Freeware
Operating System: Microsoft Windows NT4, 2000, XP, FreeBSD, Linux and other UNIX system
FREE Monthly Calendar that can be added in any html web page.
Developer: Hscripts
License: Freeware
Operating System: Linux
Comdev's personal/group event calendar system isn.
Developer: Comdev
License: Freeware
Operating System: linux, windows
Free Brolmo Calendar is a free online calendar service available to anyone with a website.
Developer: brolmo
License: Freeware
Operating System: Linux, Unix, Windows