FOX Toolkit 1.6.59
FOX is a C++ framework for graphical user interfaces. It provides an effective and simple API, traditional but platform-agnostic themes, many common widgets and controls, drag'n'drop support, selections, icons/images, tooltips and hover widgets, but also 3D features per OpenGL. Its speed comes from conservative memory management, spatial redrawing, and bi-directinal event/message passing between GUI elements.