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XLW is a C++ wrapper for the Excel C API described in the Microsoft Excel 97 Developer's Kit. It makes xll programming automatic. Its powerful interface will empower your C, C# or C++ numerics by embedding them in Excel just like the built-in functions.
Gnuplot C/C++ interface (the real extension of gnuplot_i)
...Devillard that provides a basic C/C++ interface to gnuplot.
Gnuplot_ipp provides the same light interface as gnuplot_i but makes it compatible with C++ as well.
Finally, an extra C++ wrapper that takes care of opening and closing handles and makes code more organized is provided.
All of this was performed using the C/C++'s maxima: "if you don't use it you don't pay for it". Both interfaces are available in C++, and in C you are given the original gnuplot_i interface.
This library was developed by Oscar Sanderson (http://www.oscarsanderson.com). It is an implementation of the ISO 8583 protocol. This project was created in an attempt to maintain and distribute the original code. Also includes a C++ wrapper, a COM object to use with .NET, tinyXML support to load different dialect formats, support up to 3rd bitmap in ISO messages.
DiaCanvas is a library for drawing diagrams. It is completely Model/View/Controller based and has a Visio (DIA) look. The package also contains a Python wrapper for the library.