The Michel Max - WPF Color Picker is a Control for color selection in WPF applications, with three layout options being "Spherical", "Rounded" or "Squered".
Libary and Example available.
OpenExposition is a library for automatic construction of user interfaces. After specifying variables/methods that should be exposed, the library automatically generates graphical (FLTK, Cocoa), programmatic (Python, MAX/MSP), and speech-based UI.