KGLLib is an object-oriented OpenGL library designed to ease development of OpenGL applications by providing common functionality. It uses Qt and provides comfortable Qt-style API. It is also designed to be very extensible, so applications wanting more functionality can extend it to suit their needs.
ATM KGLLib lives in KDE SVN, under /trunk/playground/libs/kgllib/. README can be found at http://websvn.kde.org/*checkout*/trunk/playground/libs/kgllib/README
It's API documentation can be found at http://freehackers.org/~rivo/kgllib/html/