At this time, we use wxWidgets in Cafu to open and manage the OpenGL main window.
This works well, but we may consider some alternatives as well:
Some additional information: - http://open.gl/context - http://rastergrid.com/blog/2010/01/flawless-alternative-to-sdl/ - http://www.jeffwofford.com/?p=1097
Note that we don't need these libs e.g. for font rendering, sound, or networking -- for these, we use dedicated libraries anyway.