The Generic Geometry Library (http://geometrylibrary.geodan.nl/) has been accepted into Boost. Boost is the well-known and widely used collection of C++ libraries (http://www.boost.org) extending the functionality of C++.
GGL
The Generic Geometry Library provides a generic implementation of geometry algorithms. It has been developed by Barend Gehrels (Geodan) and Bruno Lalande.
GGL is used among others by Geodan Mapper. A very easy to use application to visualise geographically related information.
Geodan Mapper Map