Job queue system
Easily observe changes in objects. Like a delegate, just better.
Passcode screen with Touch ID support
Written in Swift 3, supports custom views for the card and the overlay. Views get loaded lazily, so there's no issues in loading a huge amount of cards.
Goal-Based vector field path finding.
Written in Swift 3 this UITabBar alternative has a much cleaner look. Titles are only shown when tapped on.