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QuantLib - http://quantlib.org/
A free/open-source library for quantitative finance, written in C++ and exported to different languages such as Python, Ruby and Scheme. |
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http://www.unrisk.com/ - http://www.unrisk.com/
A software tool for the robust, accurate and fast pricing of complicated financial derivatives. It has a C++ kernel, but can be used under Mathematica. |
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Financial Numerical Recipes - http://finance.bi.no/~bernt/gcc_prog/recipes/recipes/
Discussion of algorithms and C++ code for advanced financial calculations by Bernt Arne Ødegaard. |
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Micro Economy Model Software - http://www.sysworks.com.ar/economics/index.htm
Mathematic Economic Model for Teachers and Students of marketing and economics. |