Here is a list of all namespaces with brief descriptions:
 osg | The core osg library provides the basic scene graph classes such as Nodes, State and Drawables, and maths and general helper classes |
 osgAnimation | The osgAnimation library provides general purpose utility classes for animation |
 osgDB | The osgDB library provides support for reading and writing scene graphs, providing a plugin framework and file utility classes |
 osgFX | The osgFX library is a NodeKit that extends the core scene graph to provide a special effects framework |
 osgGA | The 'GA' in osgGA stands for 'GUI Abstraction'; the osgGA namespace provides facilities to help developers write the glue to allow the osg to work with varying window systems |
 osgManipulator | The osgManipulator library is a NodeKit that extends the core scene graph to support 3D interactive manipulators |
 osgParticle | The osgParticle library is a NodeKit that extends the core scene graph to support particle effects |
 osgQt | The osgQt utility library provides various classes to aid the integration of OpenSceneGraph and Qt |
 osgShadow | The osgShadow library is a NodeKit that extends the core scene graph to add support for a range of shadow techniques |
 osgSim | The osgSim library is a NodeKit that extends the core scene graph to support nodes and drawables that specific to the visual simulation, such a navigational light point support and OpenFlight style degrees of freedom transform |
 osgTerrain | The osgTerrain library is a NodeKit that provides geospecifc terrain rendering support |
 osgText | The osgText library is a NodeKit that extends the core scene graph to support high quality text |
 osgUtil | The osgUtil library provides general purpose utility classes such as update, cull and draw traverses, scene graph operators such a scene graph optimisation, tri stripping, and tessellation |
 osgViewer | The osgViewer library provides high level viewer functionality designed to make it easier to write a range of different types of viewers, from viewers embedded in existing windows via SimpleViewer, through to highly scalable and flexible Viewer and Composite classes |
 osgVolume | The osgVolume library is a NodeKit that extends the core scene graph to support volume rendering |
 osgWidget | The osgWidget library is a NodeKit that extends the core scene graph to support a 2D (and eventually 3D) GUI widget set |