jqScheduler for PHP is a event calendar component built on top of open and widely used standards such as jQuery, jQuery UI, ThemeRoller, etc..
Some of the major features include:

• Multiple Resources View to display several calendars for different resources
  
• Blazing speed - only the minimal data required is sent from server to client
  
• Template View for simple and effective visualization of events assigned to different resources
  
• Data export to iCal format
  
• Printing to PDF format.
  
• Drag and drop events
  
• jQuery based client-side - familiar and powerful client-side API based on jQuery.
  
• Easy search interface in order to find the needed information immediatley
  
• ThemeRoller support - theming is based on ThemeRoller. A set of 25 themes by professional designers is available, including great free theme authoring tool.
  
• many more.