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The Visual Events Calendar is a PHP script that lets you display one or more months of the year, with the dates coloured to represent specified events. For example, that a day is available, fully-booked, unavailable, etc. Colours, fonts and event names can be fully customised. Now updated to allow sets of events. Check the Web site for a fully working demo. The scripts is free for personal use and non-profit making Web sites.
Price: $15/25

WebCalendar is a PHP-based calendar application that can be configured as a single-user calendar, a multi-user calendar for groups of users, or as an event calendar viewable by visitors. MySQL, PostgreSQL, Oracle, DB2, Interbase or ODBC is required.
Price: Freeware