3_borderless_window_for_slider_detail is a project mainly written in Objective-C, it's free.
A simple view with a slider. When you drag the slider around a new borderless window with some HUD styling pops up under the slider to show you some details.
Goal: draw a HUD styled window under the mouse while dragging an NSSlider around. The HUD window will describe the details of the slider
Classes used: