Cascade Basic Authenticator is multi-platform compatible. A highly-customizable PHP class that allows password protecting of web pages using Basic Authentication. This is easily extensible to allow authentication against any data source.
The lucid . calendar is a simple calendar application written in PHP. It is currently set up to use the MySQL database as its back end. However, I don't think it would be very hard to port it to a different database. The lucid . calendar is known to
The Availability Booking Calendar is a great Flash/PHP calendar script that can be used anywhere where booking and availability needs to be used.
Cascade allows you to easily maintain a directory of resources using web-based forms. Features include: PostgreSQL backend, arbitrarily large hierarchy of resources, auto-generated What's New, supports related categories, virtual subcategories, basic
Tukanas Calendar script is a full-featured PHP calendar in which you can add single events or ongoing events.
This is a PHP program used for creating a event calendar on the website by the webmasters. This is an event calendar and the face of the calendar is like a monthly calendar. Web visitors can enter their events online inside the calendar and it stores
Flash Web Calendar is a stand alone script which allows you to easily put a calendar on your web sites.
A Flash Calendar is a great Flash/PHP based calendar script that can be easily integrated into any web site. Flash Calendar has a user-friendly admin area that lets you customize your calendar colors and size to match your design.
php calendar script is a multi-platform compatible php calendar script function, hacked from the original source, at http://www.keithdevens.com/software/php_calendar/source.php returns a color-coded calendar as a string, based on blog entries per day
A Multi User Availability Booking Calendar is a great Flash/PHP calendar script that can be used anywhere where booking and availability needs to be used. | 
