DateDiff is a small application that uses NSDatePicker, NSCalendar, NSDateComponents, and NSValueTransformer classes to demonstrate simple functions. The user interface is constructed with bindings and target/action methods. DateDiff has two classes: DateDiffCalculator and MaxIntegerToZeroValueTransformer.
Blinged JSON Validator is a free app to validate JSON files with syntax highlighting, whitespace indentation, error messaging, and hotkeys.
