Developer Mike Benonis has released three REALbasic utilities: MiniCalendar, DarkHighlightListBox, and LibraryListBox.
MiniCalendar is a REALbasic implementation of the Calendar control seen in the System Preferences Date & Time panel. It lets you select a date by clicking and, if a date selected, the DateChanged event fires. MiniCalendar is built for simple date selection needs, such as for a to-do application or an instance when you may need to select a date for an action to occur on, according to Benonis.
DarkHighlightListBox is a REALbasic implementation of the ListBox control that Cocoa uses. (Cocoa is Apple’s collection of advanced, object-oriented application programming interfaces for developing applications written in Java and Objective-C.) The main difference is that it uses a darker color for the highlight color as opposed to the lighter highlight color that REALbasic uses.
LibraryListBox is a REALbasic implementation of the ListBox control that Apple’s i-apps use for the source lists. The main difference is that it uses a gradient for the highlight color as opposed to the highlight color that the user selected.
All three utilities are free and open source. They require REALbasic 5.1 or later.