WonderGUI
GUI library for games and multimedia.
WonderGUI is a Graphical User Interface Toolkit written in C++. Just like other, GUI toolkits such as Qt, GTK, MFC, Swing etc it provides a user interface for your program with buttons, checkboxes, menus etc.
What makes WonderGUI different from other GUI toolkits is that it doesn't have a standard look and feel, instead it is made to bring your own unique user interface to life with the widgets and layouts that you design.