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TMV is a comprehensive linear algebra library which uses operator overloading, views & delayed evaluation to simplify matrix and vector expressions in C++. It is well documented and can optionally call optimized BLAS/LAPACK for faster execution times
Two full-fledged object-oriented classes dealing with dates (class cDate) and spans of time (class cPeriod) written in C++.
The datecalc-cpp project is a sub-project of tbvs-hr (https://sourceforge.net/projects/tbvs-hr).
C++ based container/plugin manager that loads plugins from libraries and starts them at runtime. By default it provides a ThreadPool, Socket classes (ServerSocket, Socket ,Multiplexor)and a minimalist HTTP Parser. Container is configured using xml.