TheLib (http://thelib.org/) is a continously growing repository of utility and convenience classes for C++ (and C#). The name is for Totally Helpful Extension classes for C++ (/C#). TheLib uses the C++11 standard and thus requires Visual Studio 2012 or a current GCC.
See TheCharta for the ideas and ideals behind TheLib.
All classes have multi-platform implementations, mainly Windows and Linux. Most classes focus on real-time computer graphics, scientific visualization, and corresponding data and process management.
The project was started at the Visualization Research Center of the University of Stuttgart (VISUS). It is the succeeding project of the infamous VISlib. The project is a collaboration between the Visualization Research Center of the University of Stuttgart and the Computer Graphics and Visualization lab (CGV) of the University of Dresden (TU Dresden).
There is also a mailing list for TheLib users which will inform about important changes to TheLib.
This project page is only just starting. Check back for more information and more totally helpful extensions.