This page links to an italian website which provides free-to-use excel add-ins which may help with Matrix Algebra and Numerical Methods. All the downloads provided are Freeware and Open Source.
Declan Lavelle - declanlavelle@hld.ie
This website offers Freeware/Opensource excel add-ins with good documentation, which can be used to perform matrix algebra and numerical analysis.
Among the useful functions are
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