Claris Organizer has been in use for a long time on Apple machines. It has a good set of basic features for calendaring. Given its age, there a number of significant missing features, in particular support for scheduling meetings among groups of users.

Good Features:

• covers the basics fine
• provides good printing functionality
• allows overlapping items and does a pretty good job of displaying them
• provides pretty good functionality for recurring items, but monthly recurring items cannot be specified that well; for example a recurring schedule on several specific days of the month cannot be done easily
• provides good functionality for item categories, allowing naming and color coding
• provides good functionality for filtering, allowing user-defined views that can include or not include particular properties of scheduled items; for example a custom view can be defined to show only items of a particular category with titles containing a certain text pattern
• overall it's nice and simple, without a lot of superfluous features

Bad Features:

• allows only one view of one calendar to be open at a time
• has only one level of undo/redo
• the only kind of lists are for tasks
• provides a calendar "navigator" in the form of a small monthly view that is not very useful
• provides a "special date" type of scheduled item that is not useful given that is not significantly different than the "event" type of item
• provides a "contact list" feature that is not integrated with any external address book tool, making the feature not very useful
• provides a "notes" feature that is not well integrated with the calendar; specifically, notes can have a date stamp, but are not specifically associated with scheduled items

Missing Features

• no import of other calendar formats, including no import of plain text
• no place to put the location of a scheduled item; it must be squeezed into the title
• no details or notes field for scheduled items
• no yearly view
• no multi-user features at all, including no meeting items on calendar, and necessarily no user or group administration functionality